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An electron travels in a circular path of radius 20 cm in a magnetic field of `2xx10^(-3)T`. Calculate the speed of the electron. What is the potential difference through which the electron must be accelerated to acquire this speed?

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(a) `1.45 xx 10^(7) m//s`, (b) `6.61 xx 10^(-4)T`, (c ) `1.85 xx 10^(7)Hz`, (d) `5.41 xx 10^(-8)s`, (e) `8.4 xx 10^(3) m//s`
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