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:

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:

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 soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid:

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

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:

A D.C generator works on the theory of:

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

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

When a strong bar magnet is pushed into a coil of insulated copper wire connected to a galvanometer, we will observe a deflection in the galvanometer in