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  • A long solenoid current carrying a current produces a magnetic field B along its axis. If the current is double, and the number of turns per cm is halfed, the value of the new magnetic field is&nbs

A long solenoid current carrying a current produces a magnetic field B along its axis. If the current is double, and the number of turns per cm is halfed, the value of the new magnetic field is 

Option: 1

4B


Option: 2

\frac{B}{2}


Option: 3

B


Option: 4

2B


Answers (1)

best_answer

\begin{aligned} & B=\mu_0 n i \\ & B_1=\mu_0 \cdot \frac{n}{2} \cdot 2 i=\mu_0 n i=B \\ & B_1=B \end{aligned}

If the current is double and the number of turns per cm is halved, the new value of the magnetic field is B.

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Rishi

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