MHT CET 2023 14th May Evening Shift | Electromagnetic Induction Question 2 | Physics

A coil having effective area A, is held with its plane normal to magnetic field of induction B. The magnetic induction is quickly reduced by $$25 \%$$ of its initial value in 2 second. Then the e.m.f. induced across the coil will be

$$\frac{\mathrm{AB}}{8}$$

$$\frac{\mathrm{AB}}{2}$$

$$\frac{3 \mathrm{AB}}{4}$$

$$\frac{3 \mathrm{AB}}{8}$$

MHT CET 2023 14th May Evening Shift

MCQ (Single Correct Answer)

-0

The self induction (L) produced by solenoid of length '$$l$$' having '$$\mathrm{N}$$' number of turns and cross sectional area '$$A$$' is given by the formula ($$\phi=$$ magnetic flux, $$\mu_0=$$ permeability of vacuum)

$$\mathrm{L}=\mathrm{N} \phi$$

$$\mathrm{L}=\mu_0 \mathrm{NAl}$$

$$\mathrm{L}=\frac{\mu_0 \mathrm{~N}^2 \mathrm{~A}}{l}$$

$$\mathrm{L}=\frac{\mu_0 \mathrm{NA}}{l}$$

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

-0

The alternating e.m.f. induced in the secondary coil of a transformer is mainly due to

varying electric field

varying magnetic field

the iron core

heat produced in the coil

MHT CET 2023 13th May Evening Shift

MCQ (Single Correct Answer)

-0

A metal disc of radius $$R$$ rotates with an angular velocity $$\omega$$ about an axis perpendicular to its plane passing through its centre in a magnetic field of induction $$B$$ acting perpendicular to the plane of the disc. The magnitude of induced emf between the rim and axis of the disc is

$$\pi B R^2$$

$$\frac{2 \pi^2 B R^2}{\omega}$$

$$\pi B R^2 \omega$$

$$\frac{B R^2 \omega}{2}$$

PREVIOUS NEXT

MHT CET Subjects