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.

Options

A. Statement-1 is true, Statement-2 is true, Statement-2 is a correct explaination of Statement-1.
B. Statement-1 is true, Statement-2 is true, Statement-2 is not a correct explanation of Statement-1.
C. Statement-1 is true, Statement-2 is false.
D. Statement-1 is false, Statement-2 is true.

Answer

C

Explanation

In a moving coil galvanometer.
`I=(k)/(nBA)theta`
or `theta=(nBA)/(k)I`
For the given value of current I, `theta` increaases if B increases. The use of iron core increases the magnetic field, so the deflection `theta` increases ofr the same value of current I making the galvanometer more sensitive. Hence, statement-1 is correct. We know that soft iron can be easily magnetised or demagnetised, hence statement-2 is wrong.