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IGCSE Physics electricity

IGCSE Physics electricity

S0303

Please explain why B is the correct answer for this question.

(edited 4 months ago)

Reply 1

Joinedup

The resistance of X and Y in parallel is less than the resistance of X alone. This is a consequence of the rule for combining resistances in parallel.

When Y is removed the resistance in series with Z goes up - less current means less brightness.

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