MHT CET 2023 14th May Morning Shift | Electromagnetic Induction Question 80 | Physics

A magnetic field of $$2 \times 10^{-2} \mathrm{~T}$$ acts at right angles to a coil of area $$100 \mathrm{~cm}^2$$ with 50 turns. The average e.m.f. induced in the coil is $$0.1 \mathrm{~V}$$, when it is removed from the field in time '$$t$$'. The value of '$$t$$' is

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

$$0.5 \mathrm{~s}$$

$$0.1 \mathrm{~s}$$

$$1 \mathrm{~s}$$

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

$$\pi B R^2$$

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

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

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

MHT CET 2023 13th May Evening Shift

MCQ (Single Correct Answer)

-0

A conductor $$10 \mathrm{~cm}$$ long is moves with a speed $$1 \mathrm{~m} / \mathrm{s}$$ perpendicular to a field of strength $$1000 \mathrm{~A} / \mathrm{m}$$. The emf induced in the conductor is (Given : $$\mu_0=4 \pi \times 10^{-7} \mathrm{~Wb} / \mathrm{Am}$$ )

$$\pi \mathrm{~mV}$$

$$2 \pi \mathrm{~mV}$$

$$40 \pi \mu \mathrm{~V}$$

$$4 \pi \mu \mathrm{~V}$$

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