# How do you find the maximum value of emf?

Table of Contents

## How do you find the maximum value of emf?

E.m.f. generated in a rotating coil

- E = BANωsinθ = BANωsin(ωt) The maximum value of the e.m.f (Eo) is when θ (= ωt) = 90o (that is, the coil is in the plane of the field, Figure 2) and is given by.
- Maximum e.m.f (Eo) = BANω
- The r.m.s value of the e.m.f is (Er.m.s) = BANω/21/2

## How do you calculate the maximum emf induced in a coil?

Section Summary. emf=2Bℓvsinωt emf = 2 B ℓ v sin , where A is the area of an N-turn coil rotated at a constant angular velocity ω in a uniform magnetic field B.

**At what degree is the emf maximum?**

If the coil rotates with a constant angular velocity, the induced emf will vary like a sin function as in Eq (1). It will be zero when θ = ωt = 0, when the plane of the coil is normal to the field, and it will be maximum when θ = ωt = 90, or when the plane of the loop is parallel to the field.

### How is emf induced in the secondary coil?

We can make the magnetic field carry on changing by using an alternating current in the primary coil. This produces a magnetic field in the secondary coil. Since the current is alternating, the magnetic field also alternates back and forth. This changing magnetic field induces an alternating EMF in the secondary coil.

### What is the value of induced emf in the coil in AC generator?

Now, when the angle between the normal of plane and magnetic field is zero degrees, the induced emf is zero i.e.

**How do you calculate coil emf?**

The induced emf in a coil is equal to the negative of the rate of change of magnetic flux times the number of turns in the coil. It involves the interaction of charge with magnetic field.

## Why is the emf maximum?

The magnitude of induced e.m.f. is maximum, when the plane of the armature of a.c. dynamo is: When the plane of the armature is parallel to the lines of force of magnetic field, the rate of change of magnetic flux linked with it is maximum. Therefore, the e.m.f. induced in the armature in this orientation is maximum.

## What is the maximum emf produced by AC generator?

The maximum e.m.f. induced in the coil depends on the number of turns of the coil, the area of the coil, the strength of the magnetic field and the angular frequency. Hence, the maximum e.m.f. induced in the coil is equal to the maximum voltage produced i.e., maximum e.m.f. produced is $250\,V$.

**What is AC emf?**

An AC electromagnetic field, also known as EMF or EM field, is a physical field produced by moving electrically charged objects. The field can be viewed as the combination of an AC electric field and an AC magnetic field. Since it is AC by definition, it continually changes polarity from positive to negative.