Question 1

The length of a certain wire is doubled and at the same time its radius is also doubled. What is the new resistance of this wire?

Accepted Answer

A) It stays the same. 
B) It is 2 times as large. 
C) It is 4 times as large. 
D) It is 1/2 as large. 
E) It is 1/4 as large. 
A) It stays the same. 
B) It is 2 times as large. 
C) It is 4 times as large. 
D) It is 1/2 as large. 
E) It is 1/4 as large.

Question 2

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

Accepted Answer

A) current 
B) resistivity 
C) 1/(current) 
D) power 
E) 1/(resistivity) 
A) current 
B) resistivity 
C) 1/(current) 
D) power 
E) 1/(resistivity)

Question 3

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side. An ohmmeter measures 0.040 Ω across its ends. What is the resistivity of the material from which this rod is made?

Accepted Answer

A) 0.023 Ω ∙ m 
B) 0.015 Ω ∙ m 
C) 1.5 × 10-4 Ω ∙ m 
D) 2.3 × 10-6 Ω ∙ m 
A) 0.023 Ω ∙ m 
B) 0.015 Ω ∙ m 
C) 1.5 × 10-4 Ω ∙ m 
D) 2.3 × 10-6 Ω ∙ m

Question 4

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the largest possible resistance, you should attach the leads to the opposite faces that measure

Accepted Answer

A) 3 cm × 5 cm. 
B) 3 cm × 8 cm. 
C) 5 cm × 8 cm. 
D) Any pair of faces produces the same resistance. 
A) 3 cm × 5 cm. 
B) 3 cm × 8 cm. 
C) 5 cm × 8 cm. 
D) Any pair of faces produces the same resistance.

The length of a certain wire is doubled and at the same time its radius is also doubled. What is the new resistance of this wire?

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side. An ohmmeter measures 0.040 Ω across its ends. What is the resistivity of the material from which this rod is made?

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the largest possible resistance, you should attach the leads to the opposite faces that measure

Representing Motion

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Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

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Electric Potential

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Magnetic Fields and Forces

Em Induction and Em Waves

Ac Electricity

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Exam 22: Current and Resistance

The length of a certain wire is doubled and at the same time its radius is also doubled. What is the new resistance of this wire?

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side. An ohmmeter measures 0.040 Ω across its ends. What is the resistivity of the material from which this rod is made?

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the largest possible resistance, you should attach the leads to the opposite faces that measure

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Gravity

Rotational Motion

Equilibrium Ad Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Circuits

Magnetic Fields and Forces

Em Induction and Em Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

Filters