A long solenoid carring a current, produ...

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

`B/2`

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The correct Answer is:

Magnetic field at the axis of solenoid `B=mu_(0)nI` Now by changing given dimension, magnetic field,
`B.=mu_(0)(2n)(2I)`
`thereforeB.=4(mu_(0)nI)`
`thereforeB.=4B`.

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