Physicshard · Past Paper
What is the equivalent resistance of a wire of 12 Ohms bent into a circle, measured across its diameter?
A12 Ohms
B6 Ohms
C3 Ohms
D24 Ohms
✓ Correct Answer: C — 3 Ohms
The circle is split into two 6 Ohm arcs in parallel. R_eq = (6*6)/(6+6) = 36/12 = 3 Ohms.
Share this question
More from Physics
- The center of the reflecting surface of a spherical mirror is called:
- When a wave reflects from a rigid boundary, there is a phase change of:
- Which of the following does not affect the value of g on Earth?
- In an astronomical telescope, the focal length of the objective is 100 cm and that of the eyepiece is 5 cm. The magnifying power is:
- If the KE of a body is increased by 300%, by what percentage does the momentum increase?