$$e = 1.602 \times 10$$^{-19}$$~C$$

Question 1

Which letter is commonly used to represent the physical quantity 'electric field' in physics equations?

Accepted Answer

$$E$$

Question 2

What is the SI unit for electric dipole moment?

Accepted Answer

$$C \cdot m$$

Question 3

Which equation defines the quantization of electric charge?

Accepted Answer

$$Q_{tot} = \pm N e$$

Question 4

What is the value and unit of the elementary charge?

Accepted Answer

$$e = 1.602 	imes 10$$^{-19}$$~C$$

Question 5

Which equation expresses Coulomb's Law for the force between two point charges?

Accepted Answer

$$F_q = k \frac{|q_1$ q_2$|}{r^2$}$$

Question 6

If a proton and an electron are placed near each other, what will be the direction of the force between them?

Accepted Answer

They will attract each other.

Question 7

Which equation relates the electrostatic force on a charge to the electric field?

Accepted Answer

$$F = qE$$

Question 8

What is the SI unit for the number of moles?

Accepted Answer

$$mol$$

Question 9

Which equation defines the electric dipole moment?

Accepted Answer

$$p = qd$$

Question 10

What is the relationship between the electrostatic constant $$k$$ and the vacuum permittivity $$\$$varepsilon_0$$?

Accepted Answer

$$k = \frac{1}{4 \pi \$$varepsilon_0$$}$$

Question 11

A particle with charge $$q is $$placed in a uniform electric field $$E. If$$ $$q is $$negative, what is the direction of the force on the particle?

Accepted Answer

Opposite to the direction of the electric field.

Question 12

Which of the following best describes the direction of the electric field created by a positive point charge?

Accepted Answer

Away from the positive charge.

Question 13

What is the SI unit for electric field?

Accepted Answer

$$N/C$$

Question 14

Which equation gives the electric field at a distance $$r$$ from a point charge $$q$$?

Accepted Answer

$$E(r) = k \frac{|q|}{r^2$}$$

Question 15

A neutral atom loses one electron. What is the resulting net charge of the atom?

Accepted Answer

$$+e$$

Question 16

If $$N$$ electrons are transferred, what is the total mass transferred?

Accepted Answer

$$M_{transferred} = N m_e$$

Question 17

What is the name of the physical quantity measured in coulombs?

Accepted Answer

Electric charge

Question 18

The electric dipole moment vector points:

Accepted Answer

From the negative point charge to the positive point charge.

Question 19

Which letter is used to represent the number of particles in an equation?

Accepted Answer

$$N$$

Question 20

A student calculates a force using $$F = qE$$ and gets a result in units of $$C \cdot N/C. $$What is the error in their calculation?

Accepted Answer

They did not simplify the units; $$C \cdot N/C$$ simplifies to $$N.$$

Physics Vocabulary, Constants, and Fundamental Equations – Chapter 21 Study Guide

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