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A long solenoid has n turns per metre an...

A long solenoid has n turns per metre and current IA is flowing through it. The magnetic field induciton at the ends of the solenoid is

A

`(mu_(o)nI)/(2)`

B

`mu_(o)nI`

C

Zero

D

`2 mu_(o) n I`

Text Solution

Verified by Experts

The correct Answer is:
A
Magnetic field at the ends of solenoid is half of the present inside.
`B_("end") = (B_("inside"))/(2)`
`B. = (mu_(o)nI)/(2)`
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