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Magnetic Effects of Curre question bank (Physics)

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Q1.

A circular coil having 'n' turns, each of radius 'r' carries a current 'I'. The magnetic field at a distance $x = \sqrt{8}\ r$ from its centre along axis of the coil is $(\mu_0 =$ permeability of free space)

(A)

$\dfrac{\mu_0 nI}{54\ r}$

(B)

$\dfrac{\mu_0 nI}{27\ r}$

(C)

$\dfrac{\mu_0 nI}{64\ r}$

(D)

$\dfrac{\mu_0 nI}{36\ r}$

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Q2.

Two concentric coils, each of radius equal to $2\pi$ cm are placed at right angle to each other. If $3$ A and $4$ A are the currents flowing through the two coils, respectively. The magnetic induction (in Wb/m$^2$) at the centre of the coils will be {$\mu_0 = 4\pi \times 10^{-7}$ SI unit}

(A)

$5 \times 10^{-5}$

(B)

$12 \times 10^{-5}$

(C)

$7 \times 10^{-5}$

(D)

$10^{-5}$

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