# How to reduce magnetic field

The magnetic field penetrating space not always has linear structure and depends on distance to its source. To reduce magnetic field, be just removed from its source. If it is necessary to reduce the magnetic field created by the conductor with current, the solenoid or the coil of inductance for this purpose change their characteristics.

## It is required to you

• permanent magnet, conductor, solenoid, inductance coil.

## Instruction

1. Reduction of magnetic field constant the magnitaposkolka cannot change the field of a permanent magnet, just move it in space, deleting from a point where measurement is taken. This dependence is directly proportional - the magnet is farther from the necessary point, the more weakly in it magnetic field.

2. Reduction of magnetic field direct to a provodnikapodklyuchita the direct conductor to a current source. To reduce magnetic field which surrounds it it is possible to remove the conductor from the necessary point of space. Action of magnetic field will decrease in so many time when the distance will increase to the conductor. The second way to reduce magnetic field is to reduce current in the conductor. For this purpose consistently attach a rheostat to it. Induction of magnetic field will decrease in so many time how much current will decrease. It is possible to combine ways of reduction of magnetic field. For example, to reduce induction of magnetic field in this point by 6 times, it is possible to increase distance to the conductor twice and to reduce current in it by 3 times.

3. Reduction of magnetic field it is possible to solenoidaumenshit magnetic field of the solenoid attached to a current source in several ways: - to reduce induction of magnetic field of the solenoid in n of times, in the same number of times reduce current in it; - reduce quantity of rounds of the solenoid in n of times, and in as much time the intensity of its magnetic field will decrease; - increase the solenoid length n of times, without changing quantity a round (stretch it as a spring). How much length will increase, in so many time the magnetic field will decrease.

4. Reduction of magnetic field of the coil of inductance (electromagnet) to reduce magnetic field of the coil with the core, just remove it from this coil. Reduce quantity of rounds and the current proceeding on it by the same technique, as for the solenoid.

Author: «MirrorInfo» Dream Team