Assertion : Earth's magnetic field does not affect the working of a moving coil galvanometer. Reason : The earth's magnetic field is quite weak as compared to magnetic field produced in the moving coil galvanometer.
A
If both assertion and reason are true and reason is the correct explanation of assertion.
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B
If both assertion and reason are true and reason is not the correct explanation of assertion.
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C
If assertion is true but reason is false.
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D
If both assertion and reason are false.
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Solution
The correct option is B If both assertion and reason are true and reason is the correct explanation of assertion. The field magnet used in a moving coil galvanometer is very strong. The earth's magnetic field is quite weak as compared to the magnetic field produced by the field magnet. Practically the coil rotates under the effect of the strong magnetic field due to the earth does not affect the working of the moving coil galvanometer.