WB JEE 2019 | Magnetism Question 22 | Physics

WB JEE 2019

MCQ (More than One Correct Answer)

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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 ............"

moved along the direction of B.

squeezed to a smaller area

rotated about its axis

rotated about one of its diameters

WB JEE 2017

MCQ (More than One Correct Answer)

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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

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

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

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

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

WB JEE 2017

MCQ (More than One Correct Answer)

-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

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

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

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

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

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