JEE Main 2022 · 25 Jun · Shift 2 · Physics Q41

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PhysicsSingle correct+4 / -1Question 41 of 90

A long solenoid carrying a current produces a magnetic field $B$ along its axis. If the current is doubled and the number of turns per cm is halved, the new value of magnetic field will be equal to

B

2B

4B

\dfrac B2

Answer and worked solution

Official answer: A

Solenoid. $B=\mu_0nI$ ; $n\to\frac n2$ and $I\to2I$ leave $B$ unchanged.

(A)

Topics:Ampere's circuital law

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JEE Main 2022 · 25 Jun · Shift 2, Physics question 41