QJEEAdv08Ph8476: JEE Advanced 2008 Physics - Class 12 JEEAdv08Ph8476 Solution: STATEMENT 1 : The sensitivity of a moving coil galvanometer is…

Question

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STATEMENT 1 : The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.

and

STATEMENT 2 : Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.

A Statement 1 is True, Statement 2 is False
B Statement 1 is True, Statement 2 is True; Statement 2 is a CORRECT explanation for Statement 1
C Statement 1 is True, Statement 2 is True; Statement 2 is a NOT CORRECT explanation for Statement 1
D Statement 1 is False, Statement 2 is True

Accepted Answer

Statement 1 is true.

We know that,

Sensitivity $= {\theta \over I} = {{NBA} \over C}$

If we place soft iron in magnetic field it get magnetise so magnetic field increases. Hence, sensitivity of a moving coil will also increase.

Therefore, $\overrightarrow B$ the ${\theta \over I}$ also increases.

When we place any suitable magnetic material inside the core, the magnetic field will increase.

Statement 2 is wrong because soft iron can be easily magnetized and de magnetized.

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