Science : Ch 13 – Magnetic Effects of Electric Current

A current-carrying conductor is clench in totally vertical direction. In order to produce a clockwise magnetic feld around the conductor, the current should passed in the conductor:

Commercial electric motors neglect :

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:

Which of the subsequent is not attracted by a magnet:

Which of the following declaration is not correct about the magnetic field?

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

Direction of rotation of a coil in electric motor is intent by:

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:

when an iron core is inserted into a current carrying solenoid

Example of permanent magnet is

To determine the direction of force experienced by a current carrying conductor placed in a uniform magnetic feld.

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

Commercial electric motors do not use

The law states that if the forefinger indicates the direction of the magnetic field and thumb shows the direction of motion of conductor, then the middle finger will show the direction of induced current