Question

In the diagram below,if q 2 is positive then what sign is the charge on q 1 in order to produce the force required to cause the deflection in the string that supports q 1? Ci F21 Fg- m19O Positive O Not enough information to decide. O Neutral O Negative

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Answer #1

It's clear that the tension on the string has component of force acting to the right on q1, so there must be a force to the left to balance this component. This means the force on q1 due to q2 is to the left which means q2 repels q1

Hence is q2 is positive, q1 must be positive.

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