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

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

Option: 1

4B


Option: 2

B/2 


Option: 3

B


Option: 4

2B


Answers (1)

best_answer

\mathrm{B}=\mu_0 \mathrm{ni} \\
\mathrm{ \mathrm{B}_1=\left(\mu_0\right)\left(\frac{\mathrm{n}}{2}\right)(2 \mathrm{i})=\mu_0 \mathrm{ni}=\mathrm{B} }\\
\mathrm{ \Rightarrow B_1=B }.
 

Posted by

Rishabh

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