Two semicircles of R/2 each in parallel: 1/R_eq = 1/(R/2) + 1/(R/2) = 4/R. So R_eq = R/4
Back to JEE Main 2020 Electromagnetism
JEE Main 2020 — Physics Electromagnetism
easy
mcq
2020
Official previous-year question
Verified 30 May 2026.
Question
A wire of resistance R is bent to form a complete circle. The resistance between two diametrically opposite points is:
Options
- AR/4
- BR/2
- CR
- D2R
Solution
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