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NEET UG PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER
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An oil drop with charge is held stationary between two plates with an external potential difference of 400 V. If the size of the drop is doubled without any change of charge, the potential difference required to keep the drop stationary will be
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Correct option: C
3200 V
Option C (3200 V) is correct. The electric field must remain constant to keep the drop stationary, and since the weight increases by a factor of 8, the electric force must also increase by a factor of 8, requiring an 8x increase in potential difference.
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