21. In Millikan\'s oil drop experiment, if the electric field between the plates

Question

21. In Millikan's oil drop experiment, if the electric field between the plates was exactly balance the weight of the drop. Suppose oil dropieu × 10-19 C.) of just the right magnitude, it would a tiny spherical oil droplet of radius 1.3 × 10-4 cm carries a charge t electric fie, to balance the weight? (The density of oil is 0.85 g/em-1.6 a. 3.8E+6 N/C b. 6.0E+4 N/C c. 94E+2 N/C d. 4.8E+5 N/C e. 1.3E+7 N/C 22. A spherical vol ume of space has an electric field of intensity 130 N/C directed radially outward from it surface of radius 0.4 m. What is the net charge enclosed within this surface? (o 8.85 10 a. 3.5 nC b. 2.3 nC c. -3.5 nC d.-2.3 nC e. 0 nC 2. 9X10 4-2-3 105 23 A flat surface with area of 7.00 m2 is oriented at an angle to a uniform electric field with magnitude 6.0 Ifthe flux through this surface is 2.0x 106 N·m2/C, what is ? a. 61.6 578

Explanation / Answer

Solving 1st question

We know

qE=mg

Mass=m=volume*density=(4/3)*pi*r^3*density=7.82*10^(-12) g

We got E=4.8*10^(5) N/C

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