Table of Contents

- 1 When current is maximum in ac generator?
- 2 When a coil in a generator is moving perpendicular to the magnetic field the induced voltage is?
- 3 How can you maximize the peak emf from a generator?
- 4 Which method is used to induce an emf of current in a loop in AC generator?
- 5 What is the emf of the coil?
- 6 How is AC current produced?

## When current is maximum in ac generator?

Current is maximum when θ=90°, the plane of loop is parallel to magnetic field. Current is minimum when θ=180°, the plane of loop is again perpendicular to magnetic field. Current is maximum (negative) when θ=270°, the plane of loop is parallel to magnetic field.

### When a coil in a generator is moving perpendicular to the magnetic field the induced voltage is?

Therefore when A is perpendicular to the field, the induced emf is 0, and when it is parallel to the field and the rate of change of the flux is greatest, the EMF is greatest.

**What is the emf induced in single loop generator when the coil is perpendicular to field axis?**

EMF is proportional to the rate of change of magnetic field lines that go through the coil. When the plane of the coil is perpendicular it has lots of magnetic field lines passing through it. The maximum EMF will be induced when the coil is perpendicular to the field. EMF is Zero when the coil is parallel to the field.

**Why is the current in the AC generator magnetic field always flowing in one direction?**

As one side of the coil moves up through the magnetic field , a current is induced in one direction. As the rotation continues and that side of the coil moves down, the induced current reverses direction. This means that the generator produces a current that is constantly changing.

## How can you maximize the peak emf from a generator?

The peak emf from a generator can be maximized only by maximizing frequency. The peak emf from a generator can be maximized by maximizing number of turns, maximizing area of the wired loop or maximizing frequency.

### Which method is used to induce an emf of current in a loop in AC generator?

Rotating a magnet around the coils of wire.

**What happens to the current in a coil while accelerating a magnet inside it?**

What happens to the current in a coil while accelerating a magnet inside it? Explanation: A change in the magnetic field induces an emf. Hence, when the magnet is moved inside a coil, the current in it increases.

**When a coil is rotated in a magnetic field?**

The coil rotating in the magnetic field has a current that changes its direction continuously. Such a current is called an alternating current. The coil is rotated in a clockwise direction in the magnetic field at a constant rate to induce a current in the wire.

## What is the emf of the coil?

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.

### How is AC current produced?

Electric current is generated when a rotating loop of wire, known as an armature, is placed in a uniform magnetic field, or when a stationary armature is placed in a rotating magnetic field. In other words, each half of the armature periodically changes direction as the armature rotates.

**How do you increase the current of an AC generator?**

Generators

- The faster the coil rotates the faster will it cut the magnetic field and the bigger will be the output voltage.
- You could increase the output voltage of a generator by rotating it faster, increasing the number of turns on the coil or using stronger magnets,