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A beam of alpha-particles passes undefle...

A beam of `alpha`-particles passes undeflected through crossed electric and magnetic fields with `E = 6.6 xx 10^6 Nc^-1` and B = 1.2 tesla. The speed of `alpha`-particles is

A

`1.8xx10^(5)ms^(-1)`

B

`5.5xx10^(6)ms^(-1)`

C

`7.8xx10^(6)ms^(-1)`

D

`1.1xx10^(6)ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
Here `v=(E)/(B)=(6*6xx10^(6))/(1*2)=5*5xx10^(6) ms^(-1)`
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