A point source of light is used in an experiment on photoelectric effect. Which of the following...

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A point source of light is used in an experiment on photoelectric effect. Which of the following curves best represents the variation of photoelectric current \( i \) with distance \( d \) of the source from the emitter?
(a) \( a \)
(b) \( b \)
(c) \( c \)
(d) \( d \)
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