Which of the following indicates the correct sequence of steps taken in charging a gold-leaf...

WAEC 1993

Which of the following indicates the correct sequence of steps taken in charging a gold-leaf electroscope by induction? l. Removing the ebonite rod ll. Bringing a negatively charged ebonite rod close to the cap III. Earthing the cap IV. Disconnecting the earthing

A. III, II, I and IV
B. II, I, III and IV
C. III, IV II and I
D. II, III, IV and I
E. III, IV, I and II.

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Correct Answer: Option D

Explanation

Bringing a negatively charged ebonite rod close to the cap (II): This causes the electrons in the electroscope to be repelled, leaving the top of the electroscope positively charged. Earthing the cap (III): This allows electrons from the ground to flow into the electroscope, neutralizing the positive charge.
Disconnecting the earthing (IV): This isolates the electroscope while it retains the induced charge.
Removing the ebonite rod (I): This stops the influence of the charged rod. Therefore, the correct sequence is: II → III → IV → I.

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