Quiz 2

If the electric field is "E" at a distance "d" from a point charge, its magnitude will be 2E at a distance______

d/√2.

A 9.6-μC point charge is at the center of a cube with sides of length 0.500 m. What is the electric flux through one face of the cube?

1.80E5 N-m2/C

The thermal efficiency equation e = W/Qh is valid for which of the following heat engines?

All types of heat engines

A -5.00-nC point charge is on the x axis at x = 1.20 m. A second point charge Q is on the x axis at -0.600 m. If the resultant electric field at the origin is 45.0 N/C in the + x direction, what is the sign and magnitude of charge Q?

+ 5.5E-10 C

At what approximate distance from a particle with a charge of 5.00 (nC) does the electric field of that charge have a magnitude of 4.00 N/C?

3.4 m

An electron is released from rest in an electric field. The electron accelerates vertically upward, traveling 4.50 m in the first 3.00 microseconds (μs) after it is released. What are the magnitude and direction of the electric field?

5.7 N/C downward

Which of the following is the most accurate statement concerning charge?

Charge is a derived dimension (current • time), with SI units of Coulombs.

You want to increase the efficiency of a Carnot engine by changing the temperature of either its hot or cold reservoir by the same number of degrees ΔT. Which of the following choices will produce the greater increase in its thermodynamic efficiency?

Decrease the temperature of the cold reservoir by ΔT

Point P is equidistant from two point charges + and - Q of equal magnitude. If a negative point charge is placed at P without moving the original charges, the net electrical force the charges + and - Q will exert on it is____

Directly upward

An electric field of magnitude E is measured at a distance R from a point charge Q. If the charge is doubled to 2Q, and the electric field is now measured at a distance of 2R from the charge, what is the value of the new electric field?

E/2

Which of the following is the most accurate statement concerning electrical force?

Electrical force obeys the inverse square law

A charge Q and a charge 3Q are released in a uniform electric field. If the force this field exerts on 3Q is F, what force does it exert on Q?

F/3

What is the most accurate statement concerning Gauss's law?

Gauss's law provides a quantitative relationship between electric charge and the electric field associated with the electric charges enclosed on the surface of a three-dimensional object like a sphere.

f you run a Carnot heat engine in reverse, which of the following statements must be true?

More than one of the above statements are true.

Which of the following is the most accurate statement concerning the first law of thermodynamics?

More than one of the given statements are accurate

Two protons close to each other are released from rest and are completely free to move. After being released, which statement(s) is/are accurate?

More than one of the statements (a, b, c or d) are accurate.

You put 250 g of water into the freezer and make ice cubes. Which of the following is true about this process?

More than one of the statements above are true.

What is the most accurate statement concerning the relationship between entropy and the second law of thermodynamics?

More than one of these statements (a, b or c) are accurate.

What is the most accurate statement concerning the second law of thermodynamics?

No cyclic thermodynamic process can convert heat completely into mechanical work.

A point charge Q at the center of a sphere of radius R produces an electric flux of ΦE coming out of the sphere. If the charge remains the same but the radius of the sphere is doubled, what is the electric flux coming out of the sphere?

ΦE