An electric field of magnitude 5000 vm^-1 and a magnetic field of magnitude of 0.01 T exist at right angles to each other in a region of space with what speed must electrons be projected at right angles to both the fields so that they experiences no net force ?

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$5 \times 10^{5} {ms}^{- 1}$

$3 \times 10^{6} {ms}^{- 1}$

$5 \times 10^{7} {ms}^{- 1}$

$3 \times 10^{8} {ms}^{- 1}$

answer is A.

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Detailed Solution

The required speed is given by $V = \frac{E}{B} = \frac{5000}{0 .01} = 5 \times 10^{5} {ms}^{- 1}$

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