PHYSIC QUIZ

When two charges are near one another they exert an electric force on one another

• true

• false

A field force is a force that is exerted on an object by another without physical contact

• false

• true

Coulomb’s law states that the electric force

 $=\frac{k_cr^2}{q_1q_2}$  

• True

• False

When a charge is in equilibrium, the net Electric force acting on the charge is one.

• True

• False

• True and False

Two point charges, initially 2 m apart, are moved to a distance of 8 m apart. By what factor does the resulting electric force between them change? Hint :( Find Fafter/Fbefore)

• 
  

   $\frac{1}{4}$  

•  $\frac{1}{2}$  

•  $\frac{1}{16}$  

•  $\frac{2}{1}$  

Electric force and Gravitational force are different in that ____________________

• are field forces

• they are force of repulsion

• One depends on charge and the other depends on mass

• One depends on velocity and the other depends on speed of an object

Electric Force is a ___________________ quantity

• Vector

• Scalar

• Scalene

• Vector and Scalene

Which of the options below cannot be considered as a unit of Electric Force

• N

• Kgm/s²

• Kgm/s

Two point charges having charge values of 5.0 $\mu$ C  and -4.0 $\mu$ C respectively, are separated by 3.5 cm. What is the value of the electric force between them? ( $K_{c_{ }}=9\times10^{9\ \ }Nm^2\$ / $C^2$   

•  $2.4\ X\ 10^2$  N

•  $2.4\ X\ 10^{-2}$  N

•  $1.5\ X\ 10^4$  N

•  $1.5\ X\ 10^2$  N

Three point charges, q₁ = + 12.0 μC, q₂ = -20.0 μC, and q₃ = +30.0 μC , lie along the x-axis at x = 0, x = 4 cm, and x = 10 cm, respectively. Calculate the magnitude and direction of the total electrostatic force exerted on q₁.

• 1.00 X 10² N to the right

• 7.00 X 10² N to the left

• 3.05 X 10³ N to the left

• 1.00 X 10³ N to the right