Question:
A stray magnetic field does \(\textbf{NOT}\) affect the deflection of a moving coil galvanometer because
A stray magnetic field does \(\textbf{NOT}\) affect the deflection of a moving coil galvanometer because
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Strong radial magnetic fields are used in galvanometers to ensure accurate and stable deflection.
Updated On: Jan 30, 2026
- magnetic field inside galvanometer is zero
- magnetic field is equal to earth's magnetic field
- magnetic field inside galvanometer is very strong
- magnetic field inside galvanometer is very weak
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The Correct Option is C
Solution and Explanation
Step 1: Working principle of moving coil galvanometer.
A moving coil galvanometer uses a strong radial magnetic field produced by permanent magnets.
Step 2: Effect of stray magnetic fields.
Stray magnetic fields such as earth’s magnetic field are very weak compared to the strong field inside the galvanometer.
Step 3: Resulting effect.
Due to the dominance of the internal magnetic field, external stray fields do not cause noticeable deflection.
Step 4: Conclusion.
A stray magnetic field does not affect the galvanometer because the internal magnetic field is very strong.
A moving coil galvanometer uses a strong radial magnetic field produced by permanent magnets.
Step 2: Effect of stray magnetic fields.
Stray magnetic fields such as earth’s magnetic field are very weak compared to the strong field inside the galvanometer.
Step 3: Resulting effect.
Due to the dominance of the internal magnetic field, external stray fields do not cause noticeable deflection.
Step 4: Conclusion.
A stray magnetic field does not affect the galvanometer because the internal magnetic field is very strong.
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Top Questions on The Moving Coil Galvanometer
Assertion (A): The deflection in a galvanometer is directly proportional to the current passing through it.
Reason (R): The coil of a galvanometer is suspended in a uniform radial magnetic field.
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