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Magnetic Properties of Ma question bank (Physics)

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Q1.

The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility $\left.\chi_{\mathrm{mg}}=1.2 \times 10^{-5}\right)$ is :

(A)

$\frac{6}{5} \times 10^{-3} \%$

(B)

$\frac{5}{6} \times 10^{-5} \%$

(C)

$\frac{5}{6} \times 10^{-4} \%$

(D)

$\frac{5}{3} \times 10^{-5} \%$

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Q2.

The coercivity of a magnet is $5 \times 10^3 \mathrm{~A} / \mathrm{m}$. The amount of current required to be passed in a solenoid of length $30 \mathrm{~cm}$ and the number of turns 150 , so that the magnet gets demagnetised when inside the solenoid is _____A.

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