MHT CET 2024 11th May Morning Shift | Electromagnetic Induction Question 51 | Physics

The coefficient of mutual induction is 2 H and induced e.m.f. across secondary is 2 kV Current in the primary is reduced from 6 A to 3 A . The time required for the change of current is

$3 \times 10^{-3} \mathrm{~s}$

$3 \times 10^{-2} \mathrm{~s}$

$6 \times 10^{-3} \mathrm{~s}$

$3 \times 10^{-2} \mathrm{~s}$

MHT CET 2024 10th May Evening Shift

MCQ (Single Correct Answer)

-0

If current of 4 A produces magnetic flux of $3 \times 10^{-3} \mathrm{~Wb}$ through a coil of 400 turns, the energy stored in the coil will be

1.2 J

2.4 J

24 J

240 J

MHT CET 2024 10th May Evening Shift

MCQ (Single Correct Answer)

-0

Two concentric circular coils having radii ' $r_1{ }^{\prime}$ and ' $r_2$ ' $\left(r_2 \ll r_1\right)$ are placed co-axially with centres coinciding. The mutual inductance of the arrangement is ( $\mu_0=$ permeability of free space) (Both coils have single turn)

$\frac{\mu_0 \pi r_2}{2 r_1}$

$\frac{\mu_0 \pi}{2 r_1 r_2}$

$\frac{\mu_0 \pi r_1}{2 r_2}$

$\frac{\mu_0 \pi r_2^2}{2 r_1}$

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