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# What is Induced Emf and How is it Measured?

Induced emf is a form of electromotive force created when a conductor is exposed to a changing magnetic field. It is measured in volts and can be used to power electrical devices. The magnitude of induced emf is determined by several factors, including the rate of change of the magnetic field, the length of the conductor, and the number of turns in the conductor.

## The Basic Formula for Induced Emf

The magnitude of the induced emf is given by the formula *E = N * dΦ/dt*, where *E* is the induced emf, *N* is the number of turns in the conductor, and *dΦ/dt* is the rate of change of the magnetic flux. This formula is known as Faraday’s Law of Induction, and it is the basis for many of the principles of modern electrical engineering.

## The Effects of Changing Magnetic Field on Induced Emf

The magnitude of the induced emf is directly proportional to the rate of change of the magnetic field. If the rate of change increases, the magnitude of the induced emf will also increase. Conversely, if the rate of change decreases, the magnitude of the induced emf will decrease as well. This means that in order to create a large induced emf, the magnetic field must be changing rapidly.

## The Effects of Length and Number of Turns on Induced Emf

The magnitude of the induced emf is also affected by the length of the conductor and the number of turns in the conductor. If the length of the conductor is increased, the magnitude of the induced emf will also increase. Similarly, if the number of turns in the conductor is increased, the magnitude of the induced emf will also increase.

### Measuring Induced Emf

The magnitude of the induced emf can be measured using an electrometer. An electrometer is an instrument that measures the electrical potential of a conductor. By measuring the voltage difference between two points on the conductor, the magnitude of the induced emf can be determined.