Electromagnetic Induction
4.0 Len’z Law:
4.0 Len’z Law:
Current in a close conducting loop is induced by changing in magnetic flux through it. This induced current also has its magnetic flux and the direction of this induced magnetic flux decide the direction of current induced. The direction of induced current in a conducting loop is given by len’z law. It state that “Direction of induced current in induced EMF is always in such a way that it tries to oppose to change in magnetic flux.”
It can be easily explain by a simple example. In figure, a closed conducting loop is placed near a straight long wire having current $i$. If current is increasing continuously then what is the direction of induced current in loop?
In this figure current $i$ is in upward direction hence by thumb rule, the direction of magnatic field is in inward direction (inside plane of paper). As the current is increasing, magnitude of magnetic field is increasing and magnetic flux through closed conducting loop is increasing. Because of changing in magnetic flux there will be induced current in conducting loop. The direction of induced current will be in a way so that it opposes to change in magnetic flux hence in opposite direction of magnetic flux a new flux will induced in outside direction of plane. Hence current will be in anticlockwise direction.
