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Magnetic Field due to Solenoid

6.The radius ...

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6.The radius of each of two circular coils of single turn is r. The two coils are placed parallel to each other with a common axis. The distance between the centres of the coils is r/2. If equal current is sent through the two coils in the same direction, what will be the magnetic field at the centre of each coil. What will be the magnetic field at the midpoint on the line joining the two centres.

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