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प्रश्न
Which apparatus did Hallwachs use?
पर्याय
A collector plate connected to a circuit
A cadmium plate attached to an evacuated glass tube
An evacuated glass tube containing an emitter and a collector
A clean zinc plate attached to a gold-leaf electroscope
MCQ
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उत्तर
Hallwachs used a clean zinc plate attached to a gold-leaf electroscope. The electroscope made it possible to observe changes in the plate's charge.
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