WB JEE 2020 | Magnetism Question 15 | Physics

1

WB JEE 2020

MCQ (More than One Correct Answer)

+2

-0

A charged particle moves with constant velocity in a region, where no effect of gravity is felt but an electrostatic field E together with a magnetic field B may be present. Then, which of the following cases are possible?

A

E $$ \ne $$ 0, B $$ \ne $$ 0

B

E $$ \ne $$ 0, B = 0

C

E = 0, B = 0

D

E = 0, B $$ \ne $$ 0

2

WB JEE 2019

MCQ (More than One Correct Answer)

+2

-0

A metallic loop is placed in a uniform magnetic field B with the plane of the loop perpendicular to B. Under which condition(s) given an emf will be induced in the loop? "If the loop is ............"

A

moved along the direction of B.

B

squeezed to a smaller area

C

rotated about its axis

D

rotated about one of its diameters

3

WB JEE 2017

MCQ (More than One Correct Answer)

+2

-0

Two long parallel wires separated by 0.1 m carry currents of 1A and 2A, respectively in opposite directions. A third current-carrying wire parallel to both of them is placed in the same plane such that it feels no net magnetic force. It is placed at a distance of

A

0.5 m from the 1st wire, towards the 2nd wire

B

0.2 m from the 1st wire, towards the 2nd wire.

C

0.1 m from the 1st wire, away from the 2nd wire

D

0.2 m from the 1st wire, away from the 2nd wire.

4

WB JEE 2017

MCQ (More than One Correct Answer)

+2

-0

If $$\chi $$ stands for the magnetic susceptibility of a substance, $$\mu$$ for its magnetic permeability and $$\mu$$₀ for the permeability of free space, then

A

for a paramagnetic substance : $$\chi $$ < 0, $$\mu$$ > 0

B

for a paramagnetic substance : $$\chi $$ > 0, $$\mu$$ > $$\mu$$₀

C

for a diamagnetic substance : $$\chi $$ > 0, $$\mu$$ < 0

D

for a ferromagnetic substance : $$\chi $$ > 1, $$\mu$$ > $$\mu$$₀