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The magnetic field on the axis of a long solenoid having n turns per unit length and carrying a current is

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The magnetic field on the axis of a long solenoid having n turns per unit length and carrying a current is
A. `mu_(0)ni`
B. `mu_(0)n^(2)i`
C. `mu_(0)ni^(2)`
D. none of these
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Correct Answer - A
If the solenoid is of infinite length and the point is well inside the solenoid `B_("in")=mu_(0)ni`
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