Question

Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.

Answer 1

Hint: A coil of wire usually in cylindrical form that when carrying a current act like a magnet so that a movable core is drawn into the coil when a current flow and that is used especially as a switch or control for a mechanical device

Complete step by step solution:
The rule by which polarity at the ends of a current carrying solenoid is determined is known as the End rule.

End rule:
End rule denotes that if the current that flows is in anticlockwise direction the closest end is the north pole and the farthest end is south pole. If the current flow is in clockwise direction the closest end denotes to the south pole and the farthest end denotes to the north pole.

The magnetic fields that are processed by the solenoid are the same as the magnetic field processed by a bar magnet. The polarity of the magnetic field that is, when the end is magnetic-north or magnetic-south can be found from the Right-hand thumb rule. If we position the solenoid in our right hand, so that the fingers twine around it in the direction of the regular current flow, then the thumb finger will be pointing to the north pole of the magnet.

Note: The solenoid is a simple coil of wire with no directional components, so it can be simply be reversed in the circuit to create the magnetic field in the opposite direction, or you can reverse the direction of the current passing through the solenoid.