Question

Part A

You are holding a positive charge and there are positive charges of equal magnitude 1 m to your north and 1 m to your east. What is the direction of the force on the charge you are holding?

You are holding a positive charge and there are positive charges of equal magnitude 1 to your north and 1 to your east. What is the direction of the force on the charge you are holding?

	to the east
	to the southwest
	to the south
	to the northeast

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Part B

Four +2 μC charges are placed at the positions (10 cm, 0 cm), (−10 cm, 0 cm), (0 cm, 10 cm), and (0 cm, −10 cm) such that they form a diamond shape centered on the origin. A charge of +5 μC is placed at the origin. If the force between a +2 μC and a +5 μC charge separated by 10 cm has a magnitude of 9 N, which of the following can we say about the force on the +5 μC charge at the origin in this case?

Four 2 charges are placed at the positions (10 , 0 ), (10 , 0 ), (0 , 10 ), and (0 , 10 ) such that they form a diamond shape centered on the origin. A charge of 5 is placed at the origin. If the force between a 2 and a 5 charge separated by 10 has a magnitude of 9 , which of the following can we say about the force on the 5 charge at the origin in this case?

	The force on the charge at the origin is 18 N.
	The force on the charge at the origin is 36 N.
	The force on the charge at the origin is 0.
	The force on the charge at the origin is 9 N.

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Part C

A charge of +0.001 C is 1 m to your right and another charge of +1000 C is 1 m to your left. You are holding a charge of −1 C. Which of the following statements is/are true?

Check all that apply.

Check all that apply.

	Because the charge on the left is so much larger than the one on the right, there is no force from the +1 C charge on the charge you are holding.
	The net force on the charge you are holding is to your right.
	The force on the charge you are holding from the charge on your left is 1,000,000 times as large as the force from the charge on your right.
	The magnitude of the force on the charge you are holding would be the same if it were +1 C instead of −1 C.

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Part D

If three uncharged styrofoam balls are placed together and agitated so that one gains +3 C of charge and another gains +4 C of charge, how much charge must there be on the third one?

If three uncharged styrofoam balls are placed together and agitated so that one gains 3 of charge and another gains 4 of charge, how much charge must there be on the third one?

	+7 C
	+1 C
	0 C
	−7 C