Science : Ch 13 – Magnetic Effects of Electric Current

Which of the subsequent is not attracted by a magnet:

Magnetic effect of current was identified by:

A current through a horizontal power line flows from south to North direction. The direction of magnetic field line 0.5m above it is:

The strength of each of magnet reduces to half when it cut along its length into the equal parts magnetic field strength of a solenoid. Polarity of solenoid can be determined by:

A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference:

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

A coil of many circular turns of wire wrapped in the shape of a cylinder

The change in magnetic feld lines in a coil is the cause of induced electric current in it. Name the underlying phenomenon.

Which of the following is not attracted by a magnet:

The magnetic feld inside a long straight solenoid carrying current is

The phenomenon discovered by Faraday.

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