A long solenoid is formed by winding 20 turns/cm. The current necessar – McqOptions

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1.	A long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 millitesla inside the solenoid will be approximately \[(\frac{{{\mu }_{0}}}{4\pi }={{10}^{-7}}\,tesla-metre/ampere)\] [MP PMT 1994]
A.	8.0 A
B.	4.0 A
C.	2.0 A
D.	1.0 A
Answer» B. 4.0 A

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