Two identical metal spheres, X and Y, are placed on insulating stands. Sphere X is positively charged and sphere Y is neutral. The spheres are brought into contact and then separated.

What are the final charges on spheres X and Y?

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Question

Two identical metal spheres, X and Y, are placed on insulating stands. Sphere X is positively charged and sphere Y is neutral. The spheres are brought into contact and then separated.

What are the final charges on spheres X and Y?

Accepted Answer

X is positive, Y is positive — Award 1 mark for recognising that when identical conductors touch, charge distributes equally between them. Since X was positive and Y was neutral, the total positive charge is shared, leaving both spheres with equal positive charges. A is incorrect because charge is not created. C is incorrect because total charge is conserved. D is incorrect because it would require charge reversal.

Answer

X is positive, Y is negative

Answer

X is negative, Y is positive

Answer

X is positive, Y is positive

Answer

X is neutral, Y is neutral

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