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Question

# Two charges q1 and q2 are kept on x− axis and electric field at different points on x− axis is plotted against x. Choose correct statement about nature and magnitude of q1 and q2.

A
q1+ve, q2ve; |q1|>|q2|
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B
q1+ve, q2ve; |q1|<|q2|
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C
q1ve, q2+ve; |q1|>|q2|
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D
q1ve, q2+ve; |q1|<|q2|
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Solution

## The correct option is C q1−ve, q2+ve; |q1|>|q2| We can see from the graph that: (1). Just to the left of q1, the electric field is +α (let) or toward right (toward q1). Hence, q1 is negative because x is negative and E is positive. (2). Just to the right of q2, the electric field is +α (let) or toward right (away from q2). Hence, q2 is positive because x is positive and E is positive. (3). Enet=0 near q2. Hence, |q1|>|q2| because E∝qr2

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