Question

A proton and an electron are initially held 5 m apart and then released. As they...

A proton and an electron are initially held 5 m apart and then released. As they approach each other


A. the speed of the proton increases faster than the speed of the electron.
B. the speed of the electron increases faster than the speed of the proton.
C. the speed of both increases at the same rate.

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Answer #1

Force between electron and proton remains the same.Force between the particles just after the particles are released is given by Coulomb's law as

But mass of electron is less than the mass of proton,i.e, .

Therefore, from Newton's Second law , acceleration of electron must be greater than acceleration of proton.

Therefore,

Hence, the speed of the electron increases faster than speed of the proton.

The correct option is (B).

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