WB JEE 2017 | Magnetism Question 30 | Physics

WB JEE 2017

MCQ (More than One Correct Answer)

-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

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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