A proton with a velocity in the positive x-direction enters a region where there is a uniform magnetic field b in the positive y-direction. You want to balance the magnetic force with an electric force so that the proton will continue along a straight line. The electric field should be in the

Explanation:

The magnetic force acting on a charged particle is :

Here q = +q (for proton)

v is in +x direction

B is in +y direction.

So,

It is clear that the magnetic force is acting +z direction. So, to balance the magnetic force with an electric force so that the proton will continue along a straight line, the electric force must act in -z direction.

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explanation:

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