Physics midterm review

For a neutral ion with no charge to become positively charged, the atom or object must  ____________

• gain protons

• lose protons

• gain electrons

• lose electrons

This illustration depicts charging of a metal sphere through induction. If the ebonite rod and the grounding wire is removed, the charge on the conducting sphere would be __________________.

• positive

• negative

• neutral

The negative charge distribution over the surface of two isolated spheres is depicted in the diagram. One of the spheres is made of copper and the other is made of rubber. Identify the sphere that depicts the charge distribution of of an insulator such as rubber where electrons are bound in place.

• Sphere A

• Sphere B

In a lab, you rub a copper tube with a piece of fur, what best describes the charge of the copper in this scenario?

• It becomes negatively charged through friction.

• It becomes positively charged through polarization.

• It becomes positively charged through conduction.

• It becomes negatively charged through induction.

When you touch the neutrally charged metal knob of an electroscope with a negatively charged rod, you are charging by _____; whereas when you hold a  negatively charged rod close to a metal sphere, you are charging by ________________.

• induction, conduction

• conduction, induction

• force, induction

• force, conduction

Which of the following is not accurately depicted in the model above comparing the electrostatic and gravitational force?

• The repulsive vectors are only shown for Electrostatic Force.

• The magnitude of the Electrostatic Force is much greater than the Gravitational Force.

• Both forces are dependent on the distance between the objects.

In a demonstration, the teacher rubs my hair with a balloon that becomes negatively charged, my hair becomes

• negatively charged from gaining electrons

• positively charged from losing electrons

• positively charged from gaining protons.

In the diagrams above, which of the following shows the correct placement for the voltmeter and ammeter if you are measuring the voltage and current and R2?

• A

• B

• C

• D

What is the total resistance in the circuit pictured above?

• 30 ohms

• 60 ohms

• 6 ohms

• 45 ohms

Both the diagrams with A light bulb and the diagram with BC light bulb have 6 volt batteries connected to bulbs that have identical resistances:  Which of the following statements are correct when comparing series circuits "A" to "BC"?  Choose at least 3 statements for full credit.

• The total resistance for "A" is greater than "BC".

• The total current based on Ohm's Law is greater in the "A" diagram

• The total resistance for "BC" is greater than "A".

• The total voltage for "A" and "BC are equal.

• The total voltage for "A" is greater than "BC"