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Magnetic Field Due to a Straight Current Carrying Conductor

A long curren...

Question

A long current carrying conductor is placed in the plane of paper as shown in figure. If $B_{1}$ and $B_{2}$ are magnetic fields at points P and Q respectively, then

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Solution

At point p the magnetic field is into the plane and at point q the magnetic field is outside the plane of paper(using the right hand thumb rule or clasp rule)irrespective of r1>r2

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