Question 479: Electrostats & Capacitance

Question

A vertical electric field of magnitude 4.9 $$	imes$$ 105 N/C just prevents a water droplet of a mass 0.1 g from falling. The value of charge on the droplet will be :
(Given : g = 9.8 m/s2)

Accepted Answer

Since the droplet is at rest
$$\Rightarrow$$ Net force = 0
$$\Rightarrow$$ mg = qE
$$\Rightarrow$$ $$q = {{mg} \over E}$$ = 2 $$	imes$$ 10
$$-$$9
C

Answer

1.6 $$	imes$$ 10$$-$$9 C

Answer

2.0 $$	imes$$ 10$$-$$9 C

Answer

3.2 $$	imes$$ 10$$-$$9 C

Answer

0.5 $$	imes$$ 10$$-$$9 C

Electrostats & Capacitance

A vertical electric field of magnitude 4.9 $\times$ 105 N/C just prevents a water droplet of a mass 0.1 g from falling. The value of charge on the droplet will be : (Given : g = 9.8 m/s2)

Choose the correct answer: