2023 · Q107
If the length of a current-carrying wire is halved, for a given potential difference, the current in the wire would.
General SciencePhysics
- Abe doubled
- Bbe halved
- CRemain unchanged
- DBecome zero
Explanation
Resistance R = rho x L/A, so halving the length halves the resistance. By Ohm's law I = V/R, with the potential difference V unchanged, halving R doubles the current. Hence (a) 'be doubled'.