Science : Ch 13 – Magnetic Effects of Electric Current

For a current in a long straight solenoid N and S-poles are created at the two ends. Among the subsequent declaration , the incorrect declaration is:

Relative strength of magnetic field at a point in the space adjoining the magnet is shown by the:

By which instrument, the presence of magnetic field be resolved?

The nature of magnetic field line passing through the centre of current carrying circular loop is:

In electric motor, to make the coil rotating constantly in the identical direction, current is reversed in the coil after every half rotation by a device called:

A D.C generator works on the theory of:

Overloading is caused to:

The name of the effect being produced by the moving magnet

The commercial motors use a soft iron core on which the coil is wound because

Example of permanent magnet is

Which of the following is not attracted by a magnet:

An electron moves with a speed v along positive direction of the x-axis. If a magnetic feld B acts along the positive y-direction, then the force on the electron will act along

A device that can convert electrical energy into mechanical energy is

Two magnetic feld lines never intersect because the resultant force on a north pole at any point can only be in

You are holding the current-carrying wire in your right hand so that your thumb points in the direction of current, then the direction in which your fingers encircle the wire will give the direction of the magnetic feld lines around the wire.explain