Electricity and Magnetism Review

Objects that are charged have different numbers of these.

• Protons and neutrons

• Protons and electrons

• Electrons and neutrons

• Atoms and molecules

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Which charging method is described by the picture above?

• Charging by friction

• Charging by conduction

• Charging by induction

• Charging by grounding.

Both the cloth and the rod are initially neutral in charge. Which statement best describes how they become charged after these objects were rubbed together?

• Electrons moved towards the cloth and protons moved towards the rod.

• Electrons were transferred from the cloth to the rod.

  The rod became negative by losing electrons.

  The cloth become positive by gaining electrons.

• Electrons were transferred from the rod to the cloth.

  The rod became positive by losing electrons.

  The cloth become negative by gaining electrons.

• Protons were transferred from the cloth to the rod.

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What type of charging method is illustrated in this picture?

• Charging by friction

• Charging by conduction

• Charging by induction

• Charging by electromagnetism

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A metal sphere is neutral and is touched by a positively charged conductive rod. What will be the charge of the two objects after touching?

• Metal sphere will be positive

  Rod will be negative

• Metal sphere will be negative

  Rod will be positive

• Metal sphere will be negative

  Rod will be negative

• Metal sphere will be positive

  Rod will be positive

What type of charging method is shown here?

• Charging by friction

• Charging by conduction

• Charging by induction

• Charging by electromagnetism

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A neutral sphere has been polarized and grounded as shown above. Although the rod never makes contact with the sphere, It can be seen that electrons are leaving the sphere and entering the ground. What is the charge of the sphere and the rod after ground is removed?

• Rod remains negatively charged

  Sphere becomes negatively charged

• Rod becomes positively charged

  Sphere becomes negatively charged

• Rod becomes positively charged

  Sphere becomes positively charged

• Rod remains negatively charged

  Sphere becomes positively charged

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If balloon C is negatively charged, what can be stated about balloon A and Balloon B

• Balloon A and B are both negatively charged

• Balloon A is negative and balloon B is positive

• Balloon A is positive and Balloon B is negative

• Balloon A and B are both positively charged

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Match the following parts of the circuit with their description

• Voltage in volts

• Describes the electromotive force that pushes on electrons in a circuit

• Fuse

• Describes the amount that electrical devices resist the flow of charge when powered in a circuit.

• Resistance in ohms

• Used to prevent too much current flowing through a conductive pathway by breaking the circuit (like in the case of a short circuit).

• Current in Amps

• Describes the rate that charge flows through a circuit

A simple circuit shown above contains a switch. If the switch is opened, what happens to the light bulb?

• It gets brighter

• It gets dimmer but still is present

• Light goes out

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