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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?”

Asks Riya

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

Answer

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.

Please refer to the following links for more information

Define area vector in simpler terms

Area VectorArea 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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