The magnetic field lines inside a current carrying solenoid are

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Along the axis and parallel to each other

Perpendicular to the axis and equidistant from each other

Circular and they do not intersect each other

Circular at the ends but they are parallel to the axis inside the solenoid

answer is A.

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Detailed Solution

The magnetic field lines inside a current carrying solenoid are along the axis and parallel to each other.
The coil with many circular turns of insulated copper wire wrapped tightly in the shape of a cylinder is known as a solenoid. A current-carrying solenoid generates a magnetic field pattern similar to that of a bar magnet. One end of the solenoid acts as the North Pole, while the other acts as the South Pole. Magnetic field lines inside the solenoid are parallel, similar to a bar magnet, indicating that the magnetic field is the same at all points inside the solenoid.
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