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(B) solenoid is a long coil containing a large number of close turns of insulated copper wire. When an electric current flows through the solenoid,it

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same at all points

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(B) solenoid is a long coil containing a large number of close turns of insulated copper wire. When an electric current flows through the solenoid,it produces a magnetic field similar to that of a bar magnet. Inside a long,ideal solenoid,the magnetic field lines are parallel to the axis of the solenoid,indicating that the magnetic field is uniform. Therefore,the strength of the magnetic field is the same at all points inside the solenoid.

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

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