Choose the correct option:
The magnetic field inside a long straight solenoid carrying current

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Is zero

Decrease as we moved towards the end

Increase as we moved towards the end

Is same at all the points

answer is D.

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Detailed Solution

The magnetic field inside a solenoid carrying current will be the same at all points.
A solenoid is typically thought of as a coil comprising several circular turns of tightly wound, insulated copper wire that is shaped like a cylinder.
The solenoid basically has a magnetic north pole on one end and a magnetic south pole on the other.
It is known that the field lines inside the solenoid are parallel and straight.
At all points inside a magnetic field, the magnetic field inside a long, straight solenoid carrying current is typically the same.
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