MHT CET 2026 20th April Morning Shift | Electromagnetic Induction Question 3 | Physics

The self inductance of an air-core inductor (solenoid) is $0.03$ mH. By introducing an iron core into inductor the self-inductance increases to $30$ mH. The relative permeability of the core used is

$10^{-3}$

$10^{-2}$

$10^{2}$

$10^{3}$

MHT CET 2026 20th April Morning Shift

MCQ (Single Correct Answer)

-0

A coil of effective area $3$ m$^2$ is placed at right angles to a magnetic field of induction $0.05$ Wb/m$^2$. If the field is decreased to $20\%$ of its original value in $10$ second, the e.m.f. induced in the coil will be

$15$ mV

$12$ mV

$10$ mV

$5$ mV

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

Two inductors of 80 mH each are joined in parallel. The current passing through the combination is 2.1 A . The energy stored in this combination of inductors is

$4.84 \times 10^{-2} \mathrm{~J}$

$7.26 \times 10^{-2} \mathrm{~J}$

$8.82 \times 10^{-2} \mathrm{~J}$

$10.85 \times 10^{-2} \mathrm{~J}$

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

A coil of effective area $3 \mathrm{~m}^2$ is placed at right angles to a magnetic field of induction $0.05 \mathrm{~Wb} / \mathrm{m}^2$ If the field is decreased to $20 \%$ of its original value in 10 second, the e.m.f. induced in the coil will be

10 mV

12 mV

15 mV

20 mV

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