In an experiment to determine the charge of a charged sphere with a mass of 2.60

Question

In an experiment to determine the charge of a charged sphere with a mass of 2.60x10^-16kg, the sphere was injected between two horizontal charged plates, separated by 3.50cm. By increasing the voltage between the plates to 1.50x10^2V, the sphere was eventually suspended between the charged plates

1.Refer to the above information. In order to suspend the charged sphere between the plates, which of the
equations below best describes the balanced forces?
a. Electrical force must balance magoetic force.
b. Electrical force must balance gravitational force.
c. Magnetic force must balance gravitational force.
d. Electrical force must balance gravitational force and magnetic force.

2.Refer to the above information. If the upper plate of the apparatus is positively charged, then the charge on the sphere must be:
a. negative
b. positive
c. neutral
d. positive on one side and negative on the other side

3. Refer to the above information. If the voitage required to suspend the sphere was 1-50 x 102 V, then the charge on the sPhere must be:
a. 4.86x10-16 C
b. 1.70 x 10-17 C
c. 1.60 x 10-19 C
d. 5.95 x 10-19 C

Explanation / Answer

Ans: (1) b. Electrical force must balance gravitational force. (2) a. negative (3) given data:L m = 2.60*10^-16 kg d = 3.50*10^-2 m V = 1.50*10^2 V
the force acting due to gravitation, F = mg the charge, q = Fd /V = mgd/V plug the values we get q = 5.95*10^-19 C
Ans:

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