Tut 2 Basics

1. A sphere of charge 2uC and another of charge -8uC are brought into contact and then separated. Determine :
1.1. the direction of electron transfer
1.2. the new charges on each of the spheres
1.3. the amount of charge transferred
1.4. the number of electrons that were transferred (indicate direction of transfer)

1.1. from -8uC to 2uC




2. Two identical metal spheres X and Y posses charges of 2uC and 18uC respectively. They are then brought into contact. During the moment of contact :
A. 8 electrons travel from X to Y
B. 8 electrons travel from Y to X
C. no electrons travel because both X and Y are positively charged
D. 5 x 1013 electrons travel from X to Y
E. 5 x 1013 electrons travel from Y to X.

3. A sphere of charge -4uC is brought into contact with another sphere of charge -6uC. Determine the :
3.1. the direction of electron transfer
3.2. final charge of each sphere
3.3. the amount of charge transferred
3.4. the number of electrons transferred (indicate direction)
3.1. from the -6uC to the -4uC




4. Two identical conducting spheres X and Y carry charges of +3,2 x 10-19 C and
-6,4 x 10-19 C respectively.
The sphere are allowed to touch. During touching, sphere X gains...
A. 1 electron
B. 2 electrons
C. 3 electrons
D. 6 electrons

5. Dome X has a charge of 5uC. After contact with dome Y, the charge of X becomes 2uC.
5.1. What was the original charge of dome Y?
5.2. What is the new charge of dome Y?
5.3. What quantity of charge was transferred?
5.4. In which direction was the charge transferred?

2uC (same as final charge of X)

5.3. -3nC
(-1uC - 2uC)

5.4. fromY to X

6. When a charge X of 4nC was touched to another unknown charge Q, the charge of X remained unchanged.
What is the value of Q :
A. -4nC
B. 4nC
C. neutral
D. -8nC
No charge would be transferred if the original charges are equal

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