Electric Fields and Forces Quantified

Label the charges respectively:

• +; +

• +; -

• -; -

• -; +

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Label the charges respectively:

• +; +

• +; -

• -; -

• -; +

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

An electric field, E, exists in space. There are no charged particles in the field. One point in the field, point A has more electric field lines moving through it than another point in the field, point B. Which of the following is true?

• The same force is acting on points A and B, because point A is further from the source of the E-field.

• The electric field is stronger at point A and weaker at point B, possibly because point A is closer to the source of the E-field.

• The electric field is stronger at point A and weaker at point B, possibly because point A is farther from the source of the E-field.

• The electric force at point A is greater than the electric force at point B, possibly because point A is closer to the source of the E-field.

An electric field has-

• no direction

• only magnitude

• both magnitude and direction

• a uniformed strength throughout

In an electric field surrounding particles, field strength is greater where field lines are- (select all that apply)

• thickest

• longest

• farthest apart

• closer together

• shortest

The strength of an electric field at some point, A, is dependent on (check all that apply)

• the amount of charge in the object creating the field

• the type of charge in the object creating the field (+ or -)

• the distance from the charge creating the field to the point A

• Coulomb's constant, k

• the mass of the object creating the field

A charge of -1 coulombs, is 2 meters away from point A. What is the magnitude and direction of the electric field at point A?

• 1/2 N/C directed away from the charge

• 2.25 N/C directed away from the charge

• 2.25 x 10⁹ N/C directed towards the charge

• 2.25 x 10⁹ N/C directed away from the charge

• 4.5 x 10⁹ N/C directed away from the charge

A charge, Q, produces an electric field, E, at a point in space, A. If the magnitude of the charge, Q, is tripled, the strength of the field at point A will be

• 1/3 E

• 2 E

• 3 E

• 9 E

The relationship between field strength and charge is a(n) ________________ relationship

• direct

• inverse

• inverse-squared

• exponential

• quadratic

A +2C charge is placed in an electric field with a field strength of 10 N/C. What is the magnitude and direction of the electrical force that the +2C charge will experience?

• 2 N in the same direction as the field

• 2 N in the opposite direction as the field

• 20 N/C in the same direction as the field

• 20 N in the same direction as the field

• 0.2 N in the opposite direction as the field