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.

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.

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

If the current direction is parallel to the magnetic field, then there will no force on the conductor exerted by the magnetic field.

Fleming’s left hand rule.

A galvanometer is an instrument that can direct the presence of current in a circuit.

When magnet is moved quickly, more will be the changing magnetic field strength and hence larger is the induced potential difference.

electric generator works on the basis of electromagnetic induction.