Electrostatics Question 711

Question: A liquid drop having 6 excess electrons is kept stationary under a uniform electric field of25.5KVm1 . The radius of the drop is (neglect buotany)

Options:

A) 4.3×107m

B) 7.3×107m

C) 0.078×107m

D) 3.4×107m

Show Answer

Answer:

Correct Answer: B

Solution:

[b] F=qE=mg(q=6e=6×1.6×1019)

Density [d] massvolume=m43πr3 or r3=m43πd

Putting the value of v and m (= 2E/g) and solving we get r=7.8×107m



NCERT Chapter Video Solution

Dual Pane