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Statement -1 : The sensitvity of a movin...

Statement -1 : The sensitvity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.
Statement - 2: Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.

A

Statement 1 is true, Statement 2 is true, Statement 2 is a correct explanation for Statement 1.

B

Statement 1 is true, Statement 2 is true, Statement 2 is NOT a correct explanation for Statement 1.

C

Statement 1 is true, Statement 2 is false.

D

Statement 1 is false, Statement 2 is true.

Text Solution

Verified by Experts

The correct Answer is:
c
`cphi=BINA`
`phi=((BNA)/c)I`
Using iron core, value of magnetic field increases. So,
deflection increases for the same current. Hence, senstivity
increases.
Soft iron can be easily magnetized or demagnetized.
`:.` correct option is (c).
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Knowledge Check

  • Assertion : The sensitivity of a moving coil galvanometer is increased by using a soft iron cylinder as a core inside the coil. Reason : Soft iron has a high magnetic permeability and cannot be easily magnetised or demagnetised.

    A
    Assertion is True, Reason is True, Reason is a correct explanation for Assertion
    B
    Assertion is True, Reason is True, Reason is not a correct explanation for Assertion
    C
    Assertion is True, Reason is False
    D
    Assertion is False, Reason is True

  • In moving coil galvanometer, the magnetic field used is

    A
    non-uniform
    B
    radial
    C
    uniform
    D
    None of these

  • In a moving coil galvanometer, we use a radial magnetic field so that the galvanometer scale is

    A
    logarithmic
    B
    expontial
    C
    linear
    D
    None of these

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