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JEE MAIN 2022
25-06-2022
Question
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
Select the correct option:
A
B
B
2 B
C
4 B
D
$\frac{B}{2}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
$\begin{aligned} & \mathrm{B}_1=\mu_0 \mathrm{nI} \\ & \mathrm{B}_2=\mu_0\left(\frac{\mathrm{n}}{2}\right)(2 \mathrm{I}) \\ & \Rightarrow \mathrm{B}_1=\mathrm{B}_2\end{aligned}$
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