InterviewSolution
Saved Bookmarks
| 1. |
If a wire of resistance R is melted and recasted tohalf of its length, then the new resistance of thewire will bea) R/4 b) R/2 (c) R (d) 2R |
|
Answer» Resistance of the wire before melting=R Original length =l Original area =A WKT R=ρl/A New resistance R'=ρl/'A' =ρl/2/2A 1/4ρl/A = 1/4R R' = R/4 why area is double? |
|