 # How Does The Magnetic Field Of A Coil Depend On The Current In The Coil?

## What happens when the current in the coil is halved?

At the center of a current carrying coil, the magnetic field intensity is directly proportional to the current and inversely proportional to the radius of the coil.

So, if the current is doubled and radius is halved, then the value of B increases by 4 times the initial value..

## How do you increase the strength of a magnetic coil?

You can make an electromagnet stronger by doing these things:wrapping the coil around a piece of iron (such as an iron nail)adding more turns to the coil.increasing the current flowing through the coil.

## Why does increasing current increase magnetic field?

Moving charged particles create magnetic fields so if you have more charged particles moving around the strength increases. By the way the smallest magnet you can find is Bohr magnetron, due to its single electron cruising around the nuclei, creates a magnetic field.

## How does a coil create a magnetic field?

An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil, spiral or helix. … The magnetic fields generated by the separate turns of wire all pass through the center of the coil and add (superpose) to produce a strong field there. The more turns of wire, the stronger the field produced.

## How do you calculate the number of turns in a coil?

If you know the number of turns in the secondary coil and primary and secondary voltages. You can find out the number of turns in the primary using this formula: Np/Ns = Vp/Vs.

## What is the relationship between the current in the coil and the magnetic field?

Relationship Between Current and Magnetic Field The strength of a magnetic field is directly proportional to the current flowing. Therefore, if an alternating current is flowing, a magnetic field around the conductor will be produced, that is in phase with the alternating current.

## How can we induce current in a coil?

Electric current can be induced in a coil due to the relative motion between the coil and a magnetic field….AnswerInducing current on a coil by moving the coil in a magnetic field.Inducing current on a coil by by changing the magnetic field across it.More items…•

## Why does current cause magnetic field?

As Ampere suggested, a magnetic field is produced whenever an electrical charge is in motion. The spinning and orbiting of the nucleus of an atom produces a magnetic field as does electrical current flowing through a wire. The direction of the spin and orbit determine the direction of the magnetic field.

## What will be the magnetic field value at the center of a current carrying coil?

The magnetic field strength at the center of a circular loop is given by B=μ0I2R(at center of loop), where R is the radius of the loop. RHR-2 gives the direction of the field about the loop.

## What form of magnetic field lines are produced by a circular current carrying coil?

At the centre of the circular loop, The magnetic field lines are straight. Each segment of circular loop carrying current produces magnetic field lines in the same direction with in the loop. The direction of magnetic field at the centre of circular coil is perpendicular to the place of the coil.

## How do you calculate an electromagnet?

Engineers make solenoids – electromagnets – by twisting lengths of metal in a spiral fashion around a cylindrical template. You can determine the magnitude of that force by plugging the dimensions and other properties of the magnet based into a simple equation: F = (n X i)2 X magnetic constant X a / (2 X g2).

## How do you calculate the magnetic field strength of a coil?

Magneto Motive Force is expressed as a current, I flowing through a coil of N turns. The magnetic field strength of an electromagnet is therefore determined by the ampere turns of the coil with the more turns of wire in the coil the greater will be the strength of the magnetic field.

## How does the diameter of the coil affect the magnetic field?

More current would increase the magnetic field. However, the wire diameter also affects the number of turns you can wind on the coil. A thicker wire will allow fewer turns. … The end result will likely be a coil with the same magnetic field, but using lower voltage and higher current.

## Which device uses a moving wire to induce an EMF?

A electric motor is a device for transforming electrical energy into mechanical energy; an electric generator does the reverse, using mechanical energy to generate electricity. At the heart of both motors and generators is a wire coil in a magnetic field. In fact, the same device can be used as a motor or a generator.

## How does the strength of the magnetic field depend on current?

By pointing one’s right thumb along the direction of the current, the direction of the magnetic field can by found by curving one’s fingers around the wire. The strength of the magnetic field depends on the current I in the wire and r, the distance from the wire.

## How does current affect magnetic field?

Current is directly proportional to magnetic force for a straight current carrying conductor in a uniform magnetic field. So the force is directly proportional to the size of the current. … If the current is increased by five times the force will also increase by five times.

## How does the strength of the magnetic field produced by a current carrying coil depends on the radius of the coil?

1) if the radius increases the magnetic field lines go farther and farther so the strength of the magnet decrease. … So the strength of the magnet increase. 3) if the flowing in the circuit increases then the number of the magnetic field lines increased so strength of the magnet increase.

## How do you find the magnetic field of a coil?

Solenoid Magnetic Field Calculation For a solenoid of length L = m with N = turns, the turn density is n=N/L= turns/m. B = Tesla = gauss. The Earth’s magnetic field is about half a gauss.