A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire is:
A
nR
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
As 
, so the length increases n-fold. Also, since the volume of the wire remains constant, so the area of the wire decreases n-fold.
Hence, the resistance increases to 
.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
Two conducting wire of identical dimensions are connected in parallel. If and are conductivities …
What is the purpose of a shunt resistor in an ammeter?
Find the net resistance of an ammeter having coil resistance 100 Ohm and shunt resistance 10 Ohm.
If a battery with an electromotive force (emf) 'E' and internal resistance' Ri' is connected to a r…
Three identical bulbs are connected in series and these together dissipates a power P. If now the b…
A 10 m long wire of resistance is connected in series with a battery of emf 3 V and a resistance o…