Which of the following rule can be used to find the direction of the magnetic field around a straight current carrying wire?

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Maxwell’s cork screw rule

Right hand thumb rule

Both 1 and 2

Left hand thumb rule

answer is C.

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Detailed Solution

Maxwell’s cork screw rule and right hand thumb rule both can be used to find the direction of the magnetic field around a straight current carrying wire.
Maxwell’s corkscrew rule:
Imagine a right-handed corkscrew is placed with its axis coinciding with the current-carrying wire. It is now rotated such that it advances in the direction of the current, and then the direction in which the screw rotates gives the direction of the magnetic field.
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Right-hand thumb rule:
If we hold the current-carrying conductor in the right hand such that the thumb points in the current direction, then the fingers encircle the wire in the direction of the magnetic field.
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