Class 12th

The process of creating the electric current in a conductor by moving the conductor through the magnetic field or by changing the magnetic field around the conductor is known as the Electromagnetic Induction.

This scenario will also violate the principle of conservation of energy. If there is no current flowing, no force will also be required to oppose it and the whole situation just won't work as per the desire. There will be no control over the enrgy of the system.

You will be surprised to know that Lenz law is actually a result of the principle of conservation of energy. If there is no opposition to change in the magnetic flux, no external source of force will be required which will violate the principle of conservation of energy. Both these laws are interconnected to each other.

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The first and second laws weren't created together and have a gap of many years between them. Earlier, he just found out a way to calculate whether the EMF was produced or not. But with time, its direction and magnitude also needed to be calculated which resulted in him giving a second law to support his belief.

Faraday's first law only tells us if the EMF is induced or not. Unlike the second law, it doesn't have any connection with the EMF's magnitude or direction. Therefore, only the second law of faraday has a formula since it is used to calculate both the magnitude and direction of the induced EMF.

The actual role of these laws is that faraday's law tells us the magnitude of induced EMF and Lenz's law was a modification of faraday which also could tell the direction of induced EMF. These two laws are combined together to form the base of any concept related to electromagnetic induction.

This is because the original formula of magnetic flux is a dot product. As a result, the cos? in the formula appears when we remove the dot product of the formula. This cos? signifies that the direction of magnetic flux should always be perpendicular if its value is zero.

The key difference between both these terms is that magnetic flux density is the magnetic field in a particular unit area. Whereas, magnetic flux is the quantity of magnetic field in a particular space. Magnetic flux is a scalar quantity whereas magnetic flux density is a vector quantity.