Question

Two point like charges Q1 and Q2 of whose strength are equal in absolute value are placed at a certain distance from each other. Assuming the field strength to be positive in the positive direction of x-axis the signs of the charges Q1 and Q2 for the graphs (field strength versus distance) shown in Figures 1, 2, 3, and 4 are

• A. Q1 positive, Q2 negative; both positive
• B. Q1 negative, Q2 positive; Q1 positive, Q2 negative; both negative
• C. Q1 positive, Q2 negative; both negative
• D. Both positive; Q1 positive, Q2 negative; Q1 negative, Q2 positive; both negative

Hint:

The direction of the electric field is away from positive charges and towards negative charges.

Answer 1

The Correct Option is D

Step 1: Analyzing the electric field pattern.
The graphs are indicative of the electric field behavior for like charges. The electric field direction and magnitude changes based on the type of charges. The field due to positive charges spreads away from the charge.

Step 2: Conclusion.
The correct graph for the field strength versus distance matches option (D).

Final Answer: \[ \boxed{\text{(D) Both positive; Q1 positive, Q2 negative; Q1 negative, Q2 positive; both negative}} \]