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The strength of magnetic field inside a ...

The strength of magnetic field inside a long current-carrying straight solenoid is:

A

more at the ends than at the centre

B

minimum in the middle

C

same at all points

D

found to increases from one end to the other

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The correct Answer is:
C
The strength of magnetic field lines inside a long current carrying straight solenoid same at all points because the magnetic field lines are straight, equa-spaced and parallel to the axis of solenoid and hence uniform magnetic field exist inside the solenoid.
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