NCERT Class XII Chapter
Moving Charges and Magnetism
Questions With Solutions

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Question : 6
Total: 28
A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the wire?
Solution:  
The magnetic field inside the solenoid is along its axis. Here the current in the wire flows perpendicular to the axis.
F = IBl sin 90°
or F = 10 × 0.27 × 3 × 102 × 1 = 0.081 N
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