The value of Magnetic field at the end of a very long solenoid carr...

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The value of Magnetic field at the end of a very long solenoid carrying a current i will be ( \( n \) is the number of turns per unit length)
(1) \( \mu_{0} n i \)
(2) \( \frac{\mu_{0} n i}{2} \)
(3) \( \frac{\mu_{0} n i}{4} \)
(4) Zero
\( \mathrm{P} \)
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