A tiny spherical water drop has a charge of -3.00 times 10^-15 C. How many exces

Question

A tiny spherical water drop has a charge of -3.00 times 10^-15 C. How many excess electrons are on the drop? 8250 2.25 times 10^4 1.6 times 10^-19 1.87 times 10^4 A wire contains n steady current of 0.75 A. The charge that passes a cross section in 3 s is 3.2 times 10^-19 C 6.4 times 10^-19 C 1.55 C 2.25 C 3.35 C An electric Held with a magnitude of 5 times 10^4 N/c is directed along the positive y-axis. A particle with a charge q = -5.8 times 10^-19 C is placed in the field. The force on the charge is 64 times 10^-8 N perpendicular to the xy plane 2.9 times 10^-14 N along the negative y-axis 2.9 times 10^-14 N along the positive y-axis Zero

Explanation / Answer

Ans 12)

Charge on drop=-3x10^-15C

Excess electron= Charge on drop/e

=-3x10^-15/1.6x10^-19

=18750

Ans- No of excess electrons is 18750

Qs13)

1 C = 6.242e18 electrons

0.75 amps = 3 coulombs per second
3C/s x 0.75s = 2.25 C
2.25C x 6.242e18 e/C = 1.4040e19

Ans- Charge that passes is 1.404x10^19C

q14)

We know that, F = qE

F=-5.8x10^-19x5x10^4

F=2.9e-14

Ans b) 2.9x10^14 N along the negative y axis

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