Chapter 7: Electricity and Magnetism

Earthing causes positive charges to flow from the object to the ground.

• True

• False

Similar types of electric charges attract one another.

• True

• False

An electroscope is used to determine the presence of electrostatic charges.

• True

• False

What happen when a neutral comb was rubbed by the woolen cloth?

• Woollen cloth loses electrons to the comb and becomes positively charged.

• The comb gains electrons from woollen cloth and becomes negatively charged.

• Woollen cloth gains electrons from woollen cloth and becomes negatively charged.

• The comb loses electrons to the comb and becomes positively charged.

Tags

NGSS.MS-PS2-3

Does a Van de Graaff generator function properly in humid weather?

• Yes. Water molecules do not affect the electrostatic charges produced by Van de Graaff generator.

• No. Water molecules can collect on the Van de Graaff which prevent the buildup of electrical charges due to the shape of the water molecule and its own electrical forces.

____________is the quantity of electricity that is measured by the ammeter.

• Voltage

• Current

• Resistance

• Magnetic field

Which two switches will cause two light bulbs to light up when closed?

• P,Q

• P,R

• Q,R

Which of the following statements are true when all switches are closed?

• A is connected in parallel with B, but in series with C

• B is connected in series with C, but in parallel with A

• If C burns out, B will not light up but A will still light up.

• If A burns out, C will not light up but B will still light up.

Calculate the value of current (A1 and A2).

• A1=1.2A, A2=1.2A

• A1=3.6A, A2=2.4A

• A1=3.6 A, A2=1.2A

• A1=2.4A, A2=1.2A

Calculate the voltage (V1 and V2).

• V1=12V, V2=12V

• V1=6V, V2=6V

• V1=6V, V2=12V

• V1=12V, V2=6V