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# Tag Archives: carrying

## Force on Current carrying conductor

“Thin and flexible wire is kept on a table in the form of a rectangle and a strong current is send through it. How will be the shape of the wire as a result?”

Answer: The parallel sides are carrying currents in opposite directions and therefore there will be repulsion between them. So, the rectangular coil will try to expand and tend to become circular.

## The “Pulling Power” of flame

I would like to ask : does flame has its own pulling power ? e.g. when we blow out a candle , the wick often seems to be goin      with the blow . is it coz of our blow or is it the flame carrying it along with itself ? (Bikramjit Singh asks)

## 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

## 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

## Concept of magnetic dipoles

“Can u explain Concept of magnetic dipoles” – Sam Asked

Answer: A magnet always exist in pairs. A magnetic dipole consists of two equal and opposite poles separated by a small distance. The magnetic poles cannot exist alone. Monopoles does not exist.

A single current carrying loop is a simple practical  example for a magnetic dipole.

## Define area vector in simpler terms

Area vector is a vector whose magnitude is equal to the area and is directed normal to the surface.

Area as such is a scalar. So, Area vector is defined as above for use in calculations and defining some other terms like torque on a current carrying loop in a magnetic field etc.

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