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:

Magnetic effect of current was identified by:

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

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

When current is parallel to magnetic field, then force experience by the current carrying conductor placed in uniform magnetic field is

Which of the following component influence the strength of force experience by a current carrying conduct in a uniform magnetic field?

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:

The name of the effect being produced by the moving magnet

Example of permanent magnet is

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 deflection of the galvanometer becomes zero the moment the motion of