MHT CET 2024 15th May Evening Shift | Electromagnetic Induction Question 28 | Physics

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 induced e.m.f. between the rim and axis of the disc is

$\mathrm{B} \pi \mathrm{R}^2$

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

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

$\frac{\mathrm{BR}^2 \omega}{2}$

MHT CET 2024 15th May Evening Shift

MCQ (Single Correct Answer)

-0

An air cored coil has a self inductance 0.1 H . A soft iron core of relative permeability 1000 is introduced and the number of turns is reduced $\left(\frac{1}{10}\right)^{\text {th }}$. The value of self inductance is

0.1 H

1 mH

1 H

10 mH

MHT CET 2024 15th May Morning Shift

MCQ (Single Correct Answer)

-0

When the number of turns in a coil are made 3 times without any change in the length of the coil, its self inductance becomes

(9) times

two times

three times

four times

MHT CET 2024 15th May Morning Shift

MCQ (Single Correct Answer)

-0

Two solenoids of equal number of turns have their lengths as well as radii in the same ratio $1: 3$. The ratio of their self inductance will be

$1: 3$

$1: 9$

$9: 1$

$3: 2$

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