in what direction would a b field have to point for a beam of proton moving to the left to go un-deflected through a region where there is a uniform electric field pointing vertically upward?

Respuesta :

Force by the electric field is downwards as the charge is -ve

Now forced by M-F must be upwards

Using Right-hand sule, M.F must be

out of a plane or out of paper

It can be seen that for a positive charge the electric field is radially away from that positive charge. If it is a negative charge we see that the electric field points radially inward toward that negative charge. The direction of the electric field is always positive when placed in the space surrounding the source charge. The direction in which the test charge is pushed or pulled.

Since the electric field is a vector quantity it can be represented by a vector arrow. An electric field is defined mathematically as a vector field assignable to any point in space and is the force per unit charge exerted on a positive test charge resting at that point. Electric fields are generated by electric charges or time-varying magnetic fields. Generates an electric field in the surrounding spatial region. This is Coulomb's law of the conceptual electric field.

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