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Magnetic Field

Four long str...

Question

Four long straight wires are located at the corners of a square ABCD. All the wires carry equal currents.Currents in the wires A and B are inwards and in C and D are outwards.The magnetic field at the centre O is along

A

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B

CB

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C

AB

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D

CD

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Solution

The correct option is D CD
According to right hand rule the field directions with respect to the centre is shown in the figure.
From the figure we can say that the net field direction at centre is along CD.

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