1
JEE Main 2023 (Online) 8th April Evening Shift
+4
-1 An emf of $$0.08 \mathrm{~V}$$ is induced in a metal rod of length $$10 \mathrm{~cm}$$ held normal to a uniform magnetic field of $$0.4 \mathrm{~T}$$, when moves with a velocity of:

A
$$20 \mathrm{~ms}^{-1}$$
B
$$2 \mathrm{~ms}^{-1}$$
C
$$3.2 \mathrm{~ms}^{-1}$$
D
$$0.5 \mathrm{~ms}^{-1}$$
2
JEE Main 2023 (Online) 8th April Morning Shift
+4
-1 Certain galvanometers have a fixed core made of non magnetic metallic material. The function of this metallic material is

A
to bring the coil to rest quickly
B
to produce large deflecting torque on the coil
C
to oscillate the coil in magnetic field for longer period of time
D
to make the magnetic field radial
3
JEE Main 2023 (Online) 6th April Morning Shift
+4
-1 The induced emf can be produced in a coil by

A. moving the coil with uniform speed inside uniform magnetic field

B. moving the coil with non uniform speed inside uniform magnetic field

C. rotating the coil inside the uniform magnetic field

D. changing the area of the coil inside the uniform magnetic field

Choose the correct answer from the options given below:

A
A and C only
B
C and D only
C
B and D only
D
B and C only
4
JEE Main 2023 (Online) 1st February Evening Shift
+4
-1 A coil is placed in magnetic field such that plane of coil is perpendicular to the direction of magnetic field. The magnetic flux through a coil can be changed :

A. By changing the magnitude of the magnetic field within the coil.

B. By changing the area of coil within the magnetic field.

C. By changing the angle between the direction of magnetic field and the plane of the coil.

D. By reversing the magnetic field direction abruptly without changing its magnitude.

Choose the most appropriate answer from the options given below :

A
A, B and D only
B
A, B and C only
C
A and B only
D
A and C only
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