Physics · Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter
Assertion The sensitivity of a moving coil galvanometer is increased by placing
Assertion The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Reason Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.
- A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- C. Assertion is correct but Reason is incorrect
- D. Assertion is incorrect but Reason is correct
Step-by-step solution
The assertion is correct because using a soft iron core increases the magnetic field strength inside the coil, thereby increasing the torque and sensitivity of the moving coil galvanometer. The reason is incorrect because soft iron has high magnetic permeability and can be easily magnetized and demagnetized (low retentivity), not the opposite as stated.
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