Chapter 15: Electric Forces and Fields

After a glass rod is rubbed against a silk cloth, the glass rod has a charge of +5 and the silk cloth has a charge of −7. What could the original charges of the glass rod and silk cloth have been?

• +2, −5

• 0, −2

• +5, 0

• 0, −5

You are given four objects, A, B, C, and D. You discover that A and B repel each other, and that C and D repel each other. If B and C attract each other, which of the following are possible charges for A, B, C, and D in that order?

• A +, B +, C −, D +

• A −, B +, C +, D −

• A −, B −, C −, D +

• A +, B +, C −, D −

Tags

NGSS.HS-PS2-4

A test charge of –q at point P is used to measure an electric field. The field is found to have a magnitude of 2 N/C. When the charge –q is removed, the electric field at point P:

• changes in a way that cannot be determined from the information given.

• will have magnitude 2 N/C.

• will reverse in direction.

• will change in magnitude.

Point A is close to an electron. Point B is further from the electron. Points A and B and the electron are along a straight line. Which of the following statements are true?

• The field is stronger at point A than B and is directed from B to A.

• The field is weaker at point A than B and is directed from A to B.

• The field is weaker at point B than A and is directed from A to B.

• The field is stronger at point B than A and is directed from B to A.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Which of the following will change the flux through a gaussian surface caused by a charge distribution?

• changing the shape of the gaussian surface enclosing the charge distribution

• changing the size of the gaussian surface enclosing the charge distribution

• changing the location of the charge distribution within the surface

• changing the net charge within the gaussian surface

A suspended object A is attracted to a neutral wall. It's also attracted to a positively-charged object B. Which of the following is true about object A?

• It is uncharged.

• It has a negative charge.

• It has a positive charge.

• It may be either charged or uncharged.

Tags

NGSS.HS-PS3-5

Object A has a charge of +2 μC, and object B has a charge of +6 μC. Which statement is true?

• F_AB = -3F_BA

• F_AB = -F_BA

• 3F_AB = -F_BA

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A test charge of +3 μC is at a point P where the electric field due to other charges is directed to the right and has a magnitude of 4 × 10⁶ N/C. If the test charge is replaced with a −3 μC charge, the electric field at P

• has the same magnitude as before, but changes direction.

• increases in magnitude and changes direction.

• remains the same.

• decreases in magnitude and changes direction.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A circular ring of charge of radius b has a total charge q uniformly distributed around it. Choose the magnitude of the electric field at the center of the ring.

• 0

• kₑq / b²

• kₑq² / b²

• kₑq² / b

• None of these answer choices is correct.

Tags

NGSS.HS-PS2-4

A “free” electron and a “free” proton are placed in an identical electric field. Is the following statement true or false? Each particle is acted upon by equal-magnitude electric forces and both have the same magnitude of acceleration.

• False

• True

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5