A proton & an electron are placed freely in an electric field. Which of the particles will have greater acceleration and why?

The electron.

Because:

a=F/m 

For a charged particle, the force acting depends only on the magnitude and nature of charge.

F= E q

 So, as both the electron and the proton have have the same magnitude of charge, the amount of force exerted will be the same.

As, the electron has a lesser mass, it will have more acceleration.

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