Physics review!

The SI unit of Electric Charge is ...

• Joules

• Volts

• Coulomb

• Flow

The function of an electroscope is to...

Object A is Positively charged, Object B is Negatively charged what force will happen to both objects?

• nothing happens

• attract

• repel

• it does a flip

Two charged objects have a repulsive force of “F” N. If the distance separating the objects is reduced 3 times, then what is the new force? (you better use KWA)

two charges of +30μC and +90μC separated by 20 cm in the air. Determine the force

Two electric charged objects has 500 cm distance with each other they are attracted with a force of 0.1 N. If the charge of one of the object is + 10 μC, determine the charge of other object! (hint : SI unit of distance = meter)

Object A is positioned between object B and

C. Calculate the distance between object A

and B so that the force from object B and C

make object A does not move! (Assume

object B and C is not affected by other

object)

Two charges have 0.04N attraction force. If the distance between charges is halved and one of the charge is increased 3 times bigger. The electrostatic force between the charged would be _______

Using E = k x QSource/r^2

Calculate:

a. Magnitude(value/amount) of electric field in a distance 4m from a 12C electric source

b. Magnitude of electric field in a distance 1m from a 8 C electric source

If the interaction between two charges 0.0625 x 10-5 C and 16 x 10-5 C gives 0.9 N of electrical force, then determine the distance between of charges