Physicshard · Past Paper
A wire has resistance 10 Ohms. If it is cut into two equal halves and connected in parallel, the new resistance is:
A10 Ohms
B5 Ohms
C2.5 Ohms
D20 Ohms
✓ Correct Answer: C — 2.5 Ohms
Each half has 5 Ohms. Two 5 Ohm resistors in parallel give 5/2 = 2.5 Ohms.
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