Run #765

done rubric v1 session 79483006 gemini-3.7-flash 2026-09-21 02:21

What the student sent the question as it arrived, then each reading of it

OCR of the image GOOGLE_VISION

27 Write the coil as AD a moving galvano meter A galvanomder such cannot be used measure the current in a circuit, why? the principle be explain working of

The phone's own reading, which differs:

2 te fh pnndple & এp on R the principle woreing alM2n ৮aef2aland galvan dch cannot movingA me cuuetno 94ent in এ rcu, h4?

The audit's reading of the question, which is what the Product AI judged against:

27 Write the principle & explain the working of a moving coil galvanometer. A galvanometer such cannot be used to measure the current in a circuit, why?

Audit's summary: The student asked to explain the principle and working of a moving coil galvanometer and why it cannot be used to measure current directly. The tutor explained that a galvanometer detects small currents and works on the principle that a current-carrying coil in a magnetic field experiences a torque. The tutor also started explaining the construction and showed a diagram. The tutor also mentioned the formula for torque (NIABsinθ) and stated that in a moving coil galvanometer, the angle between the area vector and magnetic field is usually 90 degrees, making the torque NIAB.

Transcript 1,501 characters · 250 stripped

Read it no speaker labels — tutor and student run together

Hello, I am Sikha Singh. Good morning. Good morning. देखे सवाल. Write the principle and explain the working of moving coil galvanometer. A galvanometer as such cannot be used to measure the current in circuit Y. क्योंकि ये बहुती कम, galvanometer एक ऐसा instrument है ना, जो कि बहुती कम current को detect करता है, बहुती कम current को measure करता है. The principle of this is that a current carrying rectangular loop is placed in a magnetic field. उसके principle पे काम करता है यहां से आप देखेंगे गैलवनो मीटर क्या करता है वो small current को detect करता है यह क्या करता है detecting small current बहुत ही small current को यह detect करता है The second principle is that when a current carrying coil is placed in a magnetic field, it experiences a torque. Principle क्या है कि when a current carrying coil is placed in a uniform magnetic field, the coil experiences a torque. If the formula is NIAB sign up इसमें क्या होता है कि दो circular magric लिए जाते हैं. Iron का cylinder बनाईगे लोहे का Thank you for watching. Thank you for watching. circular magnet Three users can limit the message average. So, this is why I am telling you why the circular is taken. Because the magnetic field line comes out of the North Pole and goes south like this and then comes forward. Sir, can you tell me the working path? Yes, sir. These working are what I was telling you. So, by this, the angle between the area vector magnetic field will always be 90 degree. तो जो deflecting torque लगता है टाव, नाई ए वे प्रश्नान,

What the student sent the question as it arrived, then each reading of it

OCR of the image GOOGLE_VISION

27 Write the coil as AD a moving galvano meter A galvanomder such cannot be used measure the current in a circuit, why? the principle be explain working of

The phone's own reading, which differs:

2 te fh pnndple & এp on R the principle woreing alM2n ৮aef2aland galvan dch cannot movingA me cuuetno 94ent in এ rcu, h4?

The audit's reading of the question, which is what the Product AI judged against:

27 Write the principle & explain the working of a moving coil galvanometer. A galvanometer such cannot be used to measure the current in a circuit, why?

Transcript 1,501 characters · 250 stripped

Read it no speaker labels — tutor and student run together

Review team

no_issue

Product AI

nothing found

teaching Yes · mistakes No · satisfactory Yes

Each verdict takes your own. Yours is stored against the stack's, so “where is it wrong most often” is a question with an answer.

Work is the right way up Canvas and image orientation is upright at 0 degrees.

All frames (Frame 1 through 8) are displayed upright at 0 degrees.

seen · 100% confident
Your view
Writing is legible at video size Handwriting and diagrams are clear and easily readable.

Frames 2 to 4 show clear, well-spaced handwriting in yellow and blue, and Frames 5 to 8 show neat, multi-colored diagramming.

seen · 95% confident
Your view
The work fills the frame Not applicable to a board session

seen
Nothing distracting in shot Not applicable to a board session

seen
The student's problem is established Question is captured at the very beginning.

Frame 1 shows a clear image of the handwritten question about the principle and working of a moving coil galvanometer.

seen · 100% confident
Your view
Work proceeds in followable steps Content progresses logically from principle to diagram construction.

Frames 2-4 introduce definitions, principle, and formula, followed by a dedicated construction diagram in Frames 5-8.

seen · 90% confident
Your view
It reaches an answer The session ends mid-explanation while describing the diagram.

Frame 8 and the end of the transcript show the tutor still explaining the construction and angle between vectors, leaving the complete working and the second sub-question unfinished.

seen · 90% confident
Your view
Something was actually written board went from 18.67% to a peak of 18.67% covered (+0.00 points), ending at 4.96%

Effectively nothing was written.

measured
Your view
The concept is named before the working The core concept and principle are explicitly stated.

The tutor states: 'when a current carrying coil is placed in a uniform magnetic field, the coil experiences a torque' (supported in Frame 3 and transcript).

heard · 95% confident
Your view
Explained rather than jumped to the answer The tutor introduces the purpose and principle before moving to detailed construction.

In the initial transcript and Frames 2-4, the tutor discusses what a galvanometer is and its underlying principle before drawing the setup in Frame 5.

heard · 90% confident
Your view
Solved step by step, not in one leap The explanation follows a structured step-by-step path.

The tutor proceeds step-by-step from purpose -> principle -> formula -> construction diagram across Frames 2 through 8.

heard · 90% confident
Your view
The session opens properly Tutor greets the student and reads the question.

The transcript starts with: 'Hello, I am Sikha Singh. Good morning.' followed by reading out the question.

heard · 100% confident
Your view
No long dead air 18 gaps over 6.0s, 225s total (37% of the session), longest 36s

Silence is below -35.0dB — a crude measure on a phone microphone, so treat a low count as weak evidence rather than proof the tutor was talking.

measured
Your view

Observations judged, but not counted as the lab objecting

The camera holds still Not applicable to a board session

Not counted: Measured over 183 known-bad and 29 known-good camera sessions (2026-09-21): raised on 87% of the bad and 86% of the good, and the motion distributions are the same shape — median frame difference 25 on the bad set, 27 on the good. No threshold on this number separates them, so it is reported and not counted.

measured
Exposure is usable Not applicable to a board session

Not counted: Same two sets: it raised 6 of 183 known-bad and 2 of 29 known-good sessions. Both too few to mean anything, and the brightness distributions overlap almost exactly. The earlier reading that it 'fires more on clean sessions' was two sessions out of twenty-nine — noise, not an inverted rule.

measured
Understanding of the concept is checked The tutor does not ask conceptual questions to check student understanding.

Throughout the transcript, the tutor lectures continuously without asking any questions requiring the student to demonstrate understanding.

Not counted: Raised on 87% of known-bad and 80% of known-good sessions. The criterion is honest about why in its own `why`: the transcript has no speaker labels, so a real check and a rhetorical 'ok?' are often indistinguishable, and the bar ends up one almost no session clears. Still judged and shown, because reading it beside a recording is how it gets better.

heard
Your view

What the model returned verbatim

{
  "findings": [
    {
      "key": "orientation",
      "verdict": "ok",
      "headline": "Canvas and image orientation is upright at 0 degrees.",
      "evidence": "All frames (Frame 1 through 8) are displayed upright at 0 degrees.",
      "confidence": 1.0
    },
    {
      "key": "legibility",
      "verdict": "ok",
      "headline": "Handwriting and diagrams are clear and easily readable.",
      "evidence": "Frames 2 to 4 show clear, well-spaced handwriting in yellow and blue, and Frames 5 to 8 show neat, multi-colored diagramming.",
      "confidence": 0.95
    },
    {
      "key": "question_captured",
      "verdict": "ok",
      "headline": "Question is captured at the very beginning.",
      "evidence": "Frame 1 shows a clear image of the handwritten question about the principle and working of a moving coil galvanometer.",
      "confidence": 1.0
    },
    {
      "key": "structure",
      "verdict": "ok",
      "headline": "Content progresses logically from principle to diagram construction.",
      "evidence": "Frames 2-4 introduce definitions, principle, and formula, followed by a dedicated construction diagram in Frames 5-8.",
      "confidence": 0.9
    },
    {
      "key": "completion",
      "verdict": "weak",
      "headline": "The session ends mid-explanation while describing the diagram.",
      "evidence": "Frame 8 and the end of the transcript show the tutor still explaining the construction and angle between vectors, leaving the complete working and the second sub-question unfinished.",
      "confidence": 0.9
    },
    {
      "key": "concept_named",
      "verdict": "ok",
      "headline": "The core concept and principle are explicitly stated.",
      "evidence": "The tutor states: 'when a current carrying coil is placed in a uniform magnetic field, the coil experiences a torque' (supported in Frame 3 and transcript).",
      "confidence": 0.95
    },
    {
      "key": "explained_before_solving",
      "verdict": "ok",
      "headline": "The tutor introduces the purpose and principle before moving to detailed construction.",
      "evidence": "In the initial transcript and Frames 2-4, the tutor discusses what a galvanometer is and its underlying principle before drawing the setup in Frame 5.",
      "confidence": 0.9
    },
    {
      "key": "concept_checked",
      "verdict": "bad",
      "headline": "The tutor does not ask conceptual questions to check student understanding.",
      "evidence": "Throughout the transcript, the tutor lectures continuously without asking any questions requiring the student to demonstrate understanding.",
      "confidence": 0.9
    },
    {
      "key": "step_by_step",
      "verdict": "ok",
      "headline": "The explanation follows a structured step-by-step path.",
      "evidence": "The tutor proceeds step-by-step from purpose -> principle -> formula -> construction diagram across Frames 2 through 8.",
      "confidence": 0.9
    },
    {
      "key": "opening",
      "verdict": "ok",
      "headline": "Tutor greets the student and reads the question.",
      "evidence": "The transcript starts with: 'Hello, I am Sikha Singh. Good morning.' followed by reading out the question.",
      "confidence": 1.0
    }
  ]
}

Duration	604s (10.1 min)
Video	1280×800 @ 10.0fps
Audio track	yes
Shot changes
Dead air	18 gaps ≥6.0s · 225.0s total · longest 35.5s
Luma	avg 45.8 · min · max
Medium	board 93.5% flat background
Content written	18.67% → 4.96% (+0.0)
Transcript	1501 characters of speech
Frames	8

Run #765

The recording

What the student sent the question as it arrived, then each reading of it

Transcript 1,501 characters · 250 stripped

What the student sent the question as it arrived, then each reading of it

Transcript 1,501 characters · 250 stripped

Review team

Product AI

Measured

What the model returned verbatim

Frames in order, one every ~76s