Determining the Charge on a Sphere Given an ebonite rod, fur, and an electroscop

Question

Determining the Charge on a Sphere
Given an ebonite rod, fur, and an electroscope, steps in an experimental procedure to
determine the unknown charge on a sphere, are stated below:
1. Bring the electroscope close to the sphere with an unknown charge.
2.Touch the ebonite rod to the electroscope.
3. Rub the ebonite rod with the fur.
4. Observe the leaves on the electroscope.

1. Refer to the above information. The correct sequence of steps to conclusively determine the unknown charge
on the sphere are:
a. 1,2,3,and4
b.2,3,4,and1
c. 3,2,1, and 4
d.4, 1,3 and 2

2. Refer to the above information.The methods of charging objects in steps l,2,and3,respectively,are:
a. friction, conduction, and induction
b. conduction, friction, and induction
c. induction, conduction, and friction
d. conduction, induction and friction

3. Refer to the above information. If it is observed, after the correct experimental procedure, that the leaves of
the electroscope diverge further when the electroscope is brought near the charged sphere, the charges on the electroscope and sphere, respectively, are:
a. negative and neutral
b. negative and negative
c. negative and positive
d. positive and positive


4. Refer to the above information. If the unknown charge on the sphere were positive, then, after the correct
experimental procedure, the leaves of the electroscope should:
a. remain unchanged c. diverge further
b. converge together d. spark

5. An electron and a proton, separated by a distance "r'', experience an electrostatic force, "F"". If the distance
between the electron and the proton were doubled, then the electrostatic force would be:
a. 1/2 F
b. 1/4F
c. 2F
d. 4F

( I answered 1c, 2c, 10b, 11b, and 12a)

Explanation / Answer

1c 2c 3b 4b 5b

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