Q.

A wire of given material having length l and area of cross-section A has a resistance of 8 Ω. What would be the resistance of another wire of the same material having length l/2 and area of cross-section 2A?

see full answer

Want to Fund your own JEE / NEET / Foundation preparation ??

Take the SCORE scholarship exam from home and compete for scholarships worth ₹1 crore!*
An Intiative by Sri Chaitanya

a

3Ω

b

4Ω

c

1Ω

d

2Ω

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

For first wire

R1=ρ×IA=8Ω

Now for the second wire

R2=ρ×I/22 A=14×ρ×1 A

R2=14×R1

R2=2Ω

The resistance of the new wire is 2Ω.

Watch 3-min video & get full concept clarity
score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon