Exploring Static Electricity and Magnetism

Which of the following is an example of static electricity?

• Lightning during a thunderstorm

• The flow of current in a wire

• The movement of water in a river

• The spinning of a wind turbine

Which of the following is NOT a type of static electricity?

• Charging by friction

• Charging by conduction

• Charging by induction

• Charging by radiation

Which material is commonly used as the core of an electromagnet to increase its strength?

• Plastic

• Iron

• Wood

• Glass

Which of the following best explains why a balloon sticks to a wall after being rubbed on hair?

• The balloon becomes magnetized

• The balloon gains a static charge and induces an opposite charge on the wall

• The wall is sticky

• The balloon is heavier than air

If a negatively charged rod touches a neutral metal sphere, what will happen to the sphere?

• It will become positively charged

• It will become negatively charged

• It will remain neutral

• It will lose electrons

Which of the following is an application of electromagnets?

• Electric bell

• Solar panel

• Wind turbine

• Thermometer

A student wants to increase the strength of an electromagnet. Which action will be most effective?

• Decrease the number of coils

• Use a wooden core

• Increase the current through the coil

• Use thinner wire

Which statement best describes the relationship between electric current and magnetic field in a solenoid?

• The magnetic field is independent of the current

• The magnetic field increases as the current increases

• The magnetic field decreases as the current increases

• The magnetic field is always zero

Which method of charging involves direct contact between two objects?

• Induction

• Conduction

• Radiation

• Reflection

A plastic ruler is rubbed with a wool cloth and becomes negatively charged. What has happened at the atomic level?

• The ruler gained protons

• The ruler lost electrons

• The ruler gained electrons

• The ruler lost protons