A positivelycharged oil drop of mass 2.0 ×10 -15 kg is placed in the region of a

Question

A positivelycharged oil drop of mass 2.0 ×10-15 kg is placed in the region of a uniform electricfield between two oppositely charged, horizontal plates. The dropis found to remain stationary under the influence of the Earth'sgravitational field and the uniform electric field of 6.0 × 104 N/C. What is the magnitudeof the charge on the drop?

A positivelycharged oil drop of mass 2.0 ×10-15 kg is placed in the region of a uniform electricfield between two oppositely charged, horizontal plates. The dropis found to remain stationary under the influence of the Earth'sgravitational field and the uniform electric field of 6.0 × 104 N/C. What is the magnitudeof the charge on the drop?

A positivelycharged oil drop of mass 2.0 ×10-15 kg is placed in the region of a uniform electricfield between two oppositely charged, horizontal plates. The dropis found to remain stationary under the influence of the Earth'sgravitational field and the uniform electric field of 6.0 × 104 N/C. What is the magnitudeof the charge on the drop?

Explanation / Answer

the oil drop remian stationary under the influence ofgravitatinal force and elctic force
so net forcr is zero
here E=6.0 x 104 N/C gravitational force =mg
electric force = E*q
so,
mg=E*q
q= mg/E
= 9.1 x 10-31 * 9.81 / (6.0 *10 4)
q=3.27 * 10 -19 C

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