1.

The mass of a proton is 1840 times that of an electron. An electron and a proton, with equal kinetic energies, enter perpendicularly uniform magnetic field. Now ______ .

Answer»

The PATH of proton will be more corved than that of the electron
The PATHS of proton will be less curved than that of electron
The paths of both proton and electron will be equally curved
The paths of both will be straight

Solution :`r_(E)=(SQRT(2m_(e)k_(e)))/(qB),`
`r_(p)=(sqrt(m_(p)k_(p)))/(qB)`
`:.""r_(e)/r_(p)=sqrt((m_(e)k_(e))/(m_(p)k_(p)))=sqrt(m_(e)/(m_(p)))`
`(because k_(e)= k_(p))`
`:. "" r_(p) gt r_(e)`


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