# Energy And Electricity Quiz

13 Questions | Total Attempts: 577  Settings  This quiz covers basic concepts related to electricity, such as capacitance, ohm's law, inductance, electric force, and electric potential.

• 1.
A positive object touches a neutral electroscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens to the leaves?
• A.

They are unaffected.

• B.

They separate further.

• C.

They move closer together.

• D.

Cannot be determined without further information.

• 2.
A metal sphere of radius 2.0 cm carries a charge of 3.0 μC. What is the electric field 6.0 cm from the center of the sphere?
• A.

3.4 × 10^6 N/C

• B.

9.3 × 10^6 N/C

• C.

7.5 × 10^6 N/C

• D.

4.2 × 10^6 N/C

• E.

5.7 × 10^6 N/C

• 3.
A uniform electric field E = Esubzero j is set-up along the y-axis in a region of space. A frame is placed in that region in such a way that its plane is perpendicular to the y-axis. Which of the following changes would decrease the magnitude of the electric flux through the frame?
• A.

Sliding the frame sideways parallel to the z-axis within the xz-plane.

• B.

Moving the frame vertically along the y-axis keeping parallel to the xz-plane.

• C.

Sliding the frame sideways parallel to the x-axis within the xz-plane.

• D.

Tilting the frame so that its plane is now in the yz-plane.

• E.

Rotating the frame in the xz-plane with respect to the y-axis.

• 4.
Two long straight parallel lines of charge, #1 and #2, carry positive charge per unit lengths of Lambda1 and Lambda2, respectively. Lambda1 > Lambda2. The locus of points where the electric field is zero in this case is:
• A.

Along a line between the lines closer to line #2 than line #1.

• B.

Along a line between the lines closer to line #1 than line #2.

• C.

At a point halfway between the lines.

• D.

Along line #1.

• E.

Cannot be determined.

• 5.
An infinitely long cylinder of radius R = 2 cm carries a uniform charge density Sigma = 18 μC/m3. Calculate the electric field at distance r = 1 cm from the axis of the cylinder.
• A.

0

• B.

2.5 × 103 N/C

• C.

10.2 × 103 N/C

• D.

5.1 × 103 N/C

• E.

2.0 × 103 N/C

• 6.
A negative charge, if free, tries to move:
• A.

Away from infinity.

• B.

From high potential to low potential.

• C.

In the direction of the electric field.

• D.

From low potential to high potential.

• E.

Toward infinity.

• 7.
If the electric field is 12 V/m in the positive x-direction, what is the potential difference between the origin, (0,0), and the point (3.0 m, 4.0 m)?
• A.

48 V with the origin at the lower potential

• B.

36 V with the origin at the higher potential

• C.

48 V with the origin at the higher potential

• D.

36 V with the origin at the lower potential

• E.

Cannot be determined

• 8.
Two charges QA = +q and QB = - 3q are located on the x-axis at x= 0 and x= d respectively. Where is the electric potential equal to zero?
• A.

X = d/4

• B.

X= d/2

• C.

X= d/3

• D.

X= 2d/3

• E.

X= 3d/4

• 9.
The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this process?
• A.

It remains constant.

• B.

It increases.

• C.

It decreases.

• D.

Cannot be determined from the information given.

• 10.
A dielectric is inserted between the plates of an isolated parallel-plate capacitor that carries a charge Q. What happens to the potential energy stored in the capacitor?
• A.

The potential energy of the capacitor decreases.

• B.

The potential energy of the capacitor remains the same.

• C.

The potential energy of the capacitor increases.

• D.

The potential energy of the capacitor increases or decreases depending on the value of the dielectric constant of the capacitor.

• E.

• 11.
A 6.00-μF parallel plate capacitor has a charge of +40.0 μC and -40.0 μC on each plate, respectively. The potential energy stored in this capacitor is:
• A.

123 μJ

• B.

113 μJ

• C.

103 μJ

• D.

143 μJ

• E.

133 μJ

• 12.
Which of the following cylindrical wires has the largest resistance? All wires are made of the same material.
• A.

A wire of length L and diameter d

• B.

A wire of length L and diameter d/2

• C.

A wire of length L/2 and diameter 2d

• D.

A wire of length L/2 and diameter d

• E.

A wire of length L and diameter 2d

• 13.
A 500-W device is connected to a 120-V ac power source. What peak current flows through this device?
• A.

170 A

• B.

5.9 A

• C.

4.2 A

• D.

150 A

• E.

120 A

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