Magnetic effects

The presence of magnetic field can be determined by a --------------------------

The shape of the earth's magnetic field resembles that of an imaginary:

The nature of magnetic field line passing through the center of a current carrying circular loop is a _____________

Force on a current carrying conductor in an external magnetic field depends on

• magnetic field strength

• current through the conductor

• length of the coil

• material of the conductor

Force on a current carrying conductor in a magnetic field is maximum when the current and the field are __________________

Only a change in magnetic field lines linked with a coil can induce current in the coil

• True

• False

When North pole approaches a coil, the front side of the coil will show __________ current.

• Anticlockwise

• Clockwise

• Can't predict

In an electric motor, the direction of current in the coil changes once in each:

• One-fourth rotation

• Half rotation

• One rotation

• Doesn't change

Identify the poles of the magnet in the given figure.

• NORTH

• SOUTH

• One is north and the other is south

• Can't predict

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid will

• Increase

• Decrease

• Remains same

• Becomes zero