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A unifrom magnetic field B is acting fr...

A unifrom magnetic field `B` is acting from south to north and is of magntitdue `1.5 Wb//m^(2)`. If a proton having mass `= 1.7xx10^(-27) kg` and charge `= 1.6xx10^(-19) C` moves in this field vertically downwards with energy `5 MeV`, then the force acting on it will be

A

`7.4 xx 10^12 N`

B

`7.4 xx 10^(-12) N`

C

`7.4 xx 10^19 N`

D

`7.4 xx 10^(-19) N`

Text Solution

Verified by Experts

The correct Answer is:
B
`F = Bqv " and " KE = 1/2 mv^2 rArr F = qB sqrt( (2KE)/(m) ) `
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