Two point charges of and are separated by a distance of 30 cm in vacuum. At what point along the line connecting the charges is the net electric field zero?
Answer and explanation
Correct answer: C. 60 cm from the +4 μC charge, on the side opposite the -9 μC charge
- Step 1: For opposite charges, zero electric field occurs outside the segment, closer to the charge of smaller magnitude (). Step 2. Let distance from be . Then distance from is . Step 3. cm. Answer: 60 cm from the +4 μC charge, on the side opposite the -9 μC charge. Why not the others: The field cannot cancel between charges of opposite sign.
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