Magnetic field inside the solenoid is

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Radial

Uniform

Both (a) and (b)

Circular

answer is B.

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Detailed Solution

The magnetic field inside the solenoid tends to be uniform, which means that all the loop's field lines are pointing in the same direction, making the field uniform at all points inside the solenoid. Also, uniformity increases even more as the windings are more tightly bound and the number of turns increases.

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