Science : Ch 13 – Magnetic Effects of Electric Current

It is given that the current carrying conductor is held in exactly vertical direction.  In order to produce a clockwise magnetic feld around the conductor, the current should be passed in the conductor from top towards bottom.

Magnetic field is a vector quantity that has both direction and magnitude the direction of the magnetic field is taken to be the direction in which a north pole of the compass needle moves inside it.

Only option_x000D__x000D_-> {The pattern of the magnetic feld associated with the solenoid is diferent from the pattern of the magnetic field around a bar magnet }_x000D__x000D_is incorrect because the pattern of magnetic fields due to solenoid and bar magnet is almost same.

An electric motor is a device that converts electric energy into mechanical energy. An electric motor has an electromagnet instead of permanent magnet (as permanent magnet does not produce strong magnetic field).

As electron is moving in positive x-direction, then, according to the Maxwell’s right hand thumb rule, the current is moving in negative x-direction and the magnetic field acts on positive y-direction. Thus, the thumb will be in negative z-direction, which is the direction of force.

Brass is not a magnetic material. It is an alloy of copper and zinc

The magnetic field lines do not cross one another because the resultant force at any point on the north pole can only be in one direction. This is impossible if the lines intersect.

The magnetic field lines inside a long straight solenoid carrying current is in the form of parallel straight lines which indicates that the magnetic field is same at all points inside the solenoid

Fleming’s left hand rule.

All are the causes to occur overloading