Question

A solenoid having 2000 turns per meter has a core of area $4 \mathrm{~cm}^2$ and relative permeability 220. It carries a current of $5 \mathrm{~A}$. The which statement among the following is true?

Accepted Answer

Magnetic intensity is $10^4 \mathrm{~A} . \mathrm{m}^{-1}$. Magnetic field is $88 \pi 	imes 10^{-2} \mathrm{~T}$ and Pole strength is $876 \mathrm{~A} . \mathrm{m}$

Answer

Magnetic intensity is $10^3 \mathrm{~A} \cdot \mathrm{m}^{-1}$. Magnetic field is $88 \pi 	imes 10^{-2} \mathrm{~T}$ and Pole strength is 200 A.m

Answer

Amgnetic intensity is $10^4$ A.m ${ }^{-1}$. Magnetisation of core is $2.19 	imes 10^6$ A.m $^{-1}$ and Pole strength is 300 A.m

Answer

Magnetic intensity is $10^3$ A.m ${ }^{-1}$. Magnetic field is $44 \pi 	imes 10^{-2} \mathrm{~T}$ and Magnetisation of core is $2.19 	imes 10^6 \mathrm{~A} \cdot \mathrm{m}^{-1}$

JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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