Simple isn't it? #11

A system consists of two concentric coils of radii a=1m and b=5m, b>a. The coil with radius a has 2000 windings and coil with radius b has 1000 windings. Time varying currents are passed through the coils. I=20t passes through coil with radius b and i=40t passes through coil with radius a. An electron is placed between the coils. Find the distance, R from the centre such that it performs circular motion without changing its radius.

Use SI units

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