send some important problems from ap
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vpj21:
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It's a question of physics
Why the pole of permanent magnet are concave cylinderical in case of galvanometer
because it is done for having the magnetic field radial so that all magnetic lines of forces pass through the coil . In the armature perpendicularly to the vertical current carrying arms of the coil .
Why the magnetic line of force within the solenoid are parallel
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