A. ebonite rod
B. gold leaf electroscope
C. proof plane
D. the electrophorus

Correct Answer: Option B

B. gold leaf electroscope

SEE ALSO  A circuit has an area of 0.4m² and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rads−¹ in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is

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