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Bohr's Model of an Atom

A proton and ...

Question

A proton and an electron, initially at rest, are allowed to move under their mutal attractive force. Their centre of mass will:

A

remain stationary

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B

move towards the electron

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C

move in an unpredictable manner

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D

move towards the proton

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Solution

The correct option is A
remain stationary

We require an external force to move the centre of mass of a system of particles. The mutual force of electrical attraction is an internal force which can not affect the position of the centre of mass of the system.

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