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## magnetic field

Which one we should use Bio saverts law or amperes law to find a magnetic field?

chirag

Both are used to find the magnetic field .In the case  of physical magnet Biot-Savarts law can be used

In the case of a current carrying conductor Ampers circuital law is used

## Why direct currents aren’t used in Home circuits?

How can an alternating current change its direction while moving in a wire or any conductor? Why direct currents aren’t used in Home circuits?

Alternating current is produced by rotating a coil in a strong magnetic field (or by rotating magnet around the coil)

So, during every half rotation the direction of emf (voltage) induced in the coil reverses and hence the current too reverses its direction. The frequency of ac in India is 50 Hz and therefore in every 1 sec there will be  100 changes in direction.

Alternating currents are suitable for long distance as it can be stepped up using transformer to minimize energy loss and can be stepped down for use at home.

## Eddy currents and applications

What ere Eddy currents and what is their application?

Eddy currents (also called Foucault currents) are currents induced in conductors, when the magnetic flux linked with a solid conductor changes. The change in magnetic flux can cause a circulating flow of electrons, or a current, within the body of the conductor.

The term eddy current comes from analogous currents seen in water.

Applications

Electromagnetic braking

Metal detectors

Eddy-current testing

Electric meters (Electromechanical Induction Meters)

Eddy current brakes

Induction heating

Proximity sensor (Displacement sensors)

Traffic Detection Systems

Vending machines (detection of coins)

Coating Thickness Measurements

Sheet Resistance Measurement

Eddy current separator for metal separation

Mechanical speedometers

Safety Hazard and defect detection applications

## Direction of magnetic field due to a current carrying conductor

“How do we know the direction of magnetic field around the current carrying conductor?” Asked Nikhil

## Coulombian force and conductor

what’s effect of  coulombic forces on conductor medium ?

amk niazi

Ans:

In a conductor, the coulombian  repulsive forces  pushes the valence electrons and the electrons move away from the center to the surface ie from the region of stronger force to the region of lesser force, creating a Faraday cage

## Is potential difference is directly proptional to resistance?

Is potential difference is directly proptional to resistance? (atanu asks)

For a constant current, the potential difference is directly proportional to the resistance included in the circuit.

For a given conductor at constant temperature, resistance is a constant and the potential difference across it is directly proportional to the current passed through it.

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