Topic 2 Exper1: electric charge

What is believed to be the primary mechanism for the build-up of electric charge in thunderstorms?

• Conduction between clouds and the ground

• Friction between ice particles in clouds

• Induction from solar radiation

• Magnetic fields in the atmosphere

In the demonstration of charging by induction, how is the metal plate ultimately left with an electric charge?

• By directly touching it with a charged object

• By rubbing it with an insulating material

• By momentarily connecting it to the ground while a charged object is nearby

• By exposing it to a strong magnetic field

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What phenomenon is observed when the wheels of the Whimshurst machine rotate and electric charge builds up?

• A miniature bolt of lightning

• A magnetic field

• A heat discharge

• A sound wave

What is the primary function of a Leyden jar?

• To generate continuous electric current

• To store electric charge

• To measure electric resistance

• To amplify magnetic fields

What is the fundamental difference between a magician's art and a scientist's task, as described?

• Magicians create illusions, scientists perform experiments.

• Magicians confound senses, scientists expand senses and solve mysteries.

• Magicians entertain, scientists educate.

• Magicians use tricks, scientists use theories.

Why does her hair stand up and spread out?

• Her hair stands up due to hair products.
• Her hair stands up and spreads out due to her hairs all having the same charge

• Her hair stands up because of humidity.
• Her hair stands up and spreads out due to her hairs all having OPPOSITE charges

What does a Leiden Jar do?

• A Leiden Jar amplifies sound waves.
• A Leiden Jar stores electrical energy.
• A Leiden Jar generates heat energy.
• A Leiden Jar filters electrical signals.

What invention led to the obsolescence of large electrostatic generating machines like Van Marum's?

• The electric motor

• The incandescent light bulb

• Alessandro Volta's electric battery

• The telegraph