Electric Force and Fields

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Questions and Answers

According to Coulomb's Law, the electric force between two charges q1 and q2 is described by which equation?

  • $F_{12} = \frac{1}{4\pi\epsilon_0} \frac{q_1q_2}{r_{12}^3} \hat{r}_{12}$
  • $F_{12} = \frac{1}{4\pi\epsilon_0} \frac{q_1q_2}{r_{12}^2} \hat{r}_{12}$ (correct)
  • $F_{12} = \frac{1}{4\pi\epsilon_0} \frac{q_1q_2}{r_{12}} \hat{r}_{12}$
  • $F_{12} = \frac{1}{4\pi\epsilon_0} \frac{q_1q_2}{r_{12}^4} \hat{r}_{12}$

If two charges q1 and q2 are of the same sign, what can be said about the force experienced by q1?

  • The force is attractive.
  • The force is repulsive. (correct)
  • The force is zero.
  • The force cannot be determined.

What is the unit of electrical charge?

  • Coulomb (C) (correct)
  • Ampere (A)
  • Meter (m)
  • Newton (N)

What is Newton's 3rd Law of Motion?

<p>For every action, there is an equal and opposite reaction. (D)</p> Signup and view all the answers

What is the permittivity of free space?

<p>8.85 × 10^-12 C^2/N m^2 (B)</p> Signup and view all the answers

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Study Notes

Electric Force and Coulomb's Law

  • The electric force between two charges q1 and q2 is described by the equation: F = k * (q1 * q2) / r^2, where k is Coulomb's constant.
  • If two charges q1 and q2 are of the same sign, the force experienced by q1 is repulsive.

Units and Constants

  • The unit of electrical charge is the Coulomb (C).

Newton's Laws of Motion

  • Newton's 3rd Law of Motion states that for every action, there is an equal and opposite reaction.

Permittivity

  • The permittivity of free space is a constant, denoted by ε0, and has a value of 8.85 × 10^-12 F/m.

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