Question 1

Coulomb's formula F = KQ1Q2/R2 gives the force between two charges in free space.The value of K

Accepted Answer

A) is the same under all circumstances. 
B) is different for positive and negative charges. 
C) depends on the masses of the charged particles. 
D) equals the charge on the electron. 
A) is the same under all circumstances. 
B) is different for positive and negative charges. 
C) depends on the masses of the charged particles. 
D) equals the charge on the electron.

Question 2

A charge of +Q attracts a charge of -Q 1 cm away with a force of F.Another charge of +Q is placed next to the first one.The force on the charge of -Q is now

Accepted Answer

A) F/2 
B) F 
C) 2F 
D) 4F 
A) F/2 
B) F 
C) 2F 
D) 4F

Question 3

The voltage needed to produce a current of 8 A in a resistance of 12 ohms is

Accepted Answer

A) 0.67 V. 
B) 1.5 V. 
C) 4 V. 
D) 96 V. 
A) 0.67 V. 
B) 1.5 V. 
C) 4 V. 
D) 96 V.

Question 4

The primary coil of a transformer has 200 turns and its secondary coil has 50 turns, and the current in the secondary coil is 40 A.When a 12-V alternating current is applied to the primary coil of the transformer, the secondary voltage will be

Accepted Answer

A) 3 V. 
B) 6 V. 
C) 24 V. 
D) 48 V. 
A) 3 V. 
B) 6 V. 
C) 24 V. 
D) 48 V.

Question 5

A kilowatt hour is a unit of

Accepted Answer

A) energy. 
B) power. 
C) potential difference. 
D) electric charge. 
A) energy. 
B) power. 
C) potential difference. 
D) electric charge.

Question 6

Two charges repel each other with a force of 10-6 N when they are 10 cm apart.When they are brought closer together until they are 2 cm apart, the force between them becomes

Accepted Answer

A) 4 * 10-8 N. 
B) 5 *10-6 N. 
C) 8 * 10-6 N. 
D) 2.5 * 10-5 N. 
A) 4 * 10-8 N. 
B) 5 *10-6 N. 
C) 8 * 10-6 N. 
D) 2.5 * 10-5 N.

Question 7

A molecule that has lost an electron becomes a

Accepted Answer

A) positive ion. 
B) negative ion. 
C) nucleus. 
D) superconductor. 
A) positive ion. 
B) negative ion. 
C) nucleus. 
D) superconductor.

Question 8

An atom consists of a

Accepted Answer

A) uniform distribution of positive charge in which electrons are embedded. 
B) uniform distribution of negative charge in which electrons are embedded. 
C) small negative nucleus surrounded at a distance by protons. 
D) small positive nucleus surrounded at a distance by electrons. 
A) uniform distribution of positive charge in which electrons are embedded. 
B) uniform distribution of negative charge in which electrons are embedded. 
C) small negative nucleus surrounded at a distance by protons. 
D) small positive nucleus surrounded at a distance by electrons.

Question 9

Two charges, one positive and the other negative, are initially 2 cm apart and are then pulled away from each other until they are 6 cm apart.The force between them is now smaller by a factor of

Accepted Answer

A)    
B) 3 
C) 9 
D) 27 
A)    
B) 3 
C) 9 
D) 27

Question 10

When the voltage across a certain resistance is V, the power delivered is P.If the voltage is doubled to 2V, the power delivered becomes

Accepted Answer

A) 2P. 
B) 4P. 
C) P2. 
D) 4P2. 
A) 2P. 
B) 4P. 
C) P2. 
D) 4P2.

Coulomb's formula F = KQ₁Q₂/R² gives the force between two charges in free space.The value of K

A charge of +Q attracts a charge of -Q 1 cm away with a force of F.Another charge of +Q is placed next to the first one.The force on the charge of -Q is now

The voltage needed to produce a current of 8 A in a resistance of 12 ohms is

The primary coil of a transformer has 200 turns and its secondary coil has 50 turns, and the current in the secondary coil is 40 A.When a 12-V alternating current is applied to the primary coil of the transformer, the secondary voltage will be

A kilowatt hour is a unit of

Two charges repel each other with a force of 10^-6 N when they are 10 cm apart.When they are brought closer together until they are 2 cm apart, the force between them becomes

A molecule that has lost an electron becomes a

An atom consists of a

Two charges, one positive and the other negative, are initially 2 cm apart and are then pulled away from each other until they are 6 cm apart.The force between them is now smaller by a factor of

When the voltage across a certain resistance is V, the power delivered is P.If the voltage is doubled to 2V, the power delivered becomes

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

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Universe

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Exam 6: Electricity and Magnetism

Coulomb's formula F = KQ1Q2/R2 gives the force between two charges in free space.The value of K

A charge of +Q attracts a charge of -Q 1 cm away with a force of F.Another charge of +Q is placed next to the first one.The force on the charge of -Q is now

The voltage needed to produce a current of 8 A in a resistance of 12 ohms is

The primary coil of a transformer has 200 turns and its secondary coil has 50 turns, and the current in the secondary coil is 40 A.When a 12-V alternating current is applied to the primary coil of the transformer, the secondary voltage will be

A kilowatt hour is a unit of

Two charges repel each other with a force of 10-6 N when they are 10 cm apart.When they are brought closer together until they are 2 cm apart, the force between them becomes

A molecule that has lost an electron becomes a

An atom consists of a

Two charges, one positive and the other negative, are initially 2 cm apart and are then pulled away from each other until they are 6 cm apart.The force between them is now smaller by a factor of

When the voltage across a certain resistance is V, the power delivered is P.If the voltage is doubled to 2V, the power delivered becomes

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

Universe

Filters

Coulomb's formula F = KQ₁Q₂/R² gives the force between two charges in free space.The value of K

Two charges repel each other with a force of 10^-6 N when they are 10 cm apart.When they are brought closer together until they are 2 cm apart, the force between them becomes