1.

A beam of well collimated cathode rays travelling with a speed of 5 xx 10^(-6) ms^(-1) enters a region of mutually perpendicular electric and magnetic fields and emerge undeviated from the region if |vecB| = 0.02 T. The magnitude of the electric field is

Answer»

`10^5 V m^(-1)`
`2.5 xx 10^(8) V m^(-1)`
`1.25 xx 10^(10) V m^(-1)`
`2 xx 10^(3) V m^(-1)`

Solution :`E = v B = (5 xx 10^(6)) xx (0.02) = 1 xx 10^(5) V m^(-1)`


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