1) Released from rest in an electric field, protons would move in the direction

Question

1)  Released from rest in an electric field, protons would move in the direction of _________ potential. Released from rest, electrons would move in the direction of _________ potential. But in both cases, the electron/proton potential energy would __________.

increasing, decreasing, increase

increasing, decreasing, decrease

decreasing, increasing, increase

decreasing, increasing, decrease

2)  Field lines always point in the direction of _________ potential. Equipotential lines are always ________ to electric field lines.

increasing, parallel

decreasing, parallel

increasing, perpendicular

decreasing, perpendicular

3)  At a distance of 0.5 m from a point charge, the electric potential is -100 V. What is the potential at a distance of 0.25 m ?

-200 V

-100 V

-50 V

4)  In the previous problem, what is the sign of the point charge? (Assume V = 0 at infinity.)

positive

negative

not enough information is given

Explanation / Answer

1. decreasing , increasing , increasing

2.)  increasing, perpendicular

3.) Electric Potential = KQ/r = KQ/0.5 = -100 V

so KQ/0.25 would be -200V

Ans - 200V

4.) negative charge

electric potential =( potential energy at point P - Potential energy at infinity)/q = KQ/r = -200V

so Q shoud be negative.

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