Explain with an experiment principle of Electromagnetic induction. Which law will give the direction of electric current?
Explain with an experiment principle of Electromagnetic induction. Which law will give the direction of electric current?
The motion of a magnet with respect to a coil or a change in the magnetic field induce a potential difference in the coil and produces induced current. This is called electromagnetic induction.
i) Motion of a magnet with respect to a coil produces induced current:-
If a magnet is moved towards or away from a coil of wire connected to a galvanometer, the galvanometer needle shows a deflection. This shows that current is induced in the coil due to the motion of the magnet.
ii) Change in magnetic field produces induced current:-
Take two coils of wires wound around a cylindrical paper roll. Connect one coil to a battery and the other coil to a galvanometer. If current is passed through the first coil, the galvanometer needle shows a deflection in the second coil. If the current is disconnected, the needle moves in the opposite direction. This shows that current is induced due to change in magnetic field.
The direction of induced current is given by Fleming’s Right Hand Rule. It states that ‘ If the thumb, forefinger and middle finger of the right hand are held perpendicular to each other such that the thumb points in the direction of motion of the conductor, the forefinger points in the direction of the magnetic field, then the middle finger shows the direction of induced current ’.
The motion of a magnet with respect to a coil or a change in the magnetic field induce a potential difference in the coil and produces induced current. This is called electromagnetic induction.
i) Motion of a magnet with respect to a coil produces induced current:-
If a magnet is moved towards or away from a coil of wire connected to a galvanometer, the galvanometer needle shows a deflection. This shows that current is induced in the coil due to the motion of the magnet.
ii) Change in magnetic field produces induced current:-
Take two coils of wires wound around a cylindrical paper roll. Connect one coil to a battery and the other coil to a galvanometer. If current is passed through the first coil, the galvanometer needle shows a deflection in the second coil. If the current is disconnected, the needle moves in the opposite direction. This shows that current is induced due to change in magnetic field.
The direction of induced current is given by Fleming’s Right Hand Rule. It states that ‘ If the thumb, forefinger and middle finger of the right hand are held perpendicular to each other such that the thumb points in the direction of motion of the conductor, the forefinger points in the direction of the magnetic field, then the middle finger shows the direction of induced current ’.
