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 high magnetic permeability and cannot be easily magnetized or demagnetized.

Question

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 high magnetic permeability and cannot be easily magnetized or demagnetized. (A) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (B) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. (C) If Assertion is correct but Reason is incorrect (D) If both the Assertion and Reason are incorrect

Tardigrade Admin · Accepted Answer

Sensitivity of galvanometer, s = (θ/i) ≃ ( tan θ/i) = (μ0 N/2 R BH) If a magnetic material is placed inside coil of galvanometer, then s' = (μr μ0 N/2RBH)

Q. 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 high magnetic permeability and cannot be easily magnetized or demagnetized.

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

If Assertion is correct but Reason is incorrect

If both the Assertion and Reason are incorrect

Sensitivity of galvanometer,
$s = \frac{θ}{i} ≃ \frac{t a n θ}{i} = \frac{μ _{0} N}{2 R B _{H}}$
If a magnetic material is placed inside coil of galvanometer, then
$s^{'} = \frac{μ _{r} μ _{0} N}{2 R B _{H}}$

Q. 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 high magnetic permeability and cannot be easily magnetized or demagnetized.