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Solution


Q.

The strength of magnetic field inside a long current carrying straight solenoid is:
1 more at the ends than at the centre.  
2 minimum in the middle.  
3 uniform at all points.  
4 found to increase from one end to the other.  

Ans.

(3)

Inside the solenoid, magnetic field lines are straight. This indicates strong magnetic field. Hence, magnetic field is uniform at all points inside the solenoid.