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Effect of negative voltage to the grid is ________

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Effect of negative voltage to the grid is ________

(a) no force

(b) a gravitational force

(c) an attractive force

(d) a repulsive force

This question was addressed to me in an interview for internship.

The query is from Cathode Ray Tube topic in section Oscilloscopes of Electrical Measurements

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Best answer
The correct choice is (d) a repulsive force

For explanation: Since the electron is negatively charged, application of a negative voltage to the control grid produces a repulsive force.

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