Evan Renjith's answer to Peng's Primary 6 Science question.

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Evan Renjith
Evan Renjith's answer
7 answers (A Helpful Person)
Answer: 1

The tip of U is not connected. The wire is connected to the metal case. The metal case is an electrical conductor so it acted as a wire.

S and T are connected properly with the wire, thus, they can still light up

Therefore, the answer is 1.