Electric fields

If two objects attract each other, which is NOT a possible explanation?

• One must be negatively charged while the other is positively charged

• One must be charged while the other is uncharged

• They must have the same charge

the positively charged particle in an atom, never leaves the nucleus, determines the element

• proton

• neutron

• electron

What types of charges attract?

• Positive and Positive
• Positive and Neutral
• Negative and Neutral
• Positive and Negative

An object becomes charged when the atoms in the object gain or lose

• electrons
• protons
• neutrons
• all of the above

Charging by ____ occurs when electrons are transferred from one object to another by direct contact.

• reduction
• induction
• conduction
• friction

What is the standard unit for charge?

• Newtons (N)

• Coulombs (C)

• Electros (e)

• Protos (P)

What does the "k" represent in Coulomb's Law?

• charge

• Coulomb's Constant

• kilometers

• distance between charges

What does the "r" represent in Coulomb's Law?

• radius of the electron

• distance between charges

• radius of the proton

• distance a charge will travel

If the distance doubles, what happens to the force?

• Reduced by half
• Reduced by 1/4
• Stays the same
• Quadruples

Force between two bodies having charges 5.0 x 10² μC and 1.0 x 10² μC separated by distance of 0.50 m in air is

• 1800 N
• 1.0 x 10³ N
• 2200 N
• 3.0 x 10² N