Compare the electric field strengths E1 and E2 at the two points labeled 1 and 2

Question

Compare the electric field strengths E1 and E2 at the two points labeled 1 and 2.

For each,is E1 >E2,is E1 =E2,or is E1?

Explanation / Answer

Electric field strength due to a point charge, E = k q / r^2 Direction: Electric field due to positive charge: away from the positive charge Electric field due to negative charge: towards the negative charge (a) At point 1: Electric fields due to both charges are equal and opposite. ( E1 = 0 ) At point 2: Electric fields due to both charges are in same direction and added up. Ans: E2 > E1 (b) At point 1:Electric fields due to both charges are in same direction and added up. At point 2:Electric field due to both charges are opposite. Ans:E1 > E2 (c) At point 1:Electric field due to both charges are opposite. At point 2:Electric field due to both charges are opposite. Ans: E1 = E2 (d) At point 1:Electric fields due to both charges are equal and opposite. ( E1 = 0 ) At point 2:Electric field due to both charges are opposite. Ans:E2 > E1 (e) At point 1:Electric field due to both charges are unequal and opposite. At point 2:Electric field due to both charges are unequal and in same direction. Ans: E2 > E1 (f) At point 1:Electric field due to both charges are unequal and in same direction. At point 2:Electric field due to both charges are unequal and opposite. Ans: E1 > E2

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