The radius of a circular plate is increasing at the rate of 0.02 cm/sec. when the radius is 10cm. Then the rate at which the area increases is

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

0.4π sq.cm/sec

0 .5π sq.cm/sec .

0.6π sq.cm/sec

0.1π sqcm/sec

answer is A.

(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

drdt=0.02, r=10 A=πr2 dAdt=2πr.drdt=2π(10)(0.02)=2π(0.2) = 0.4π

Watch 3-min video & get full concept clarity