Electric Charge, Field, Coulomb

Two positive point charges repel each other with force 0.36 N when their separation is 1.5 m. What force do they exert on each other when their separation is 1.0 m?

• 0.81 N

• 0.36 N

• 0.24 N

• 0.16 N

Two small hollow metal spheres hung on insulating threads attract one another as shown. It is known that a positively charged rod will attract sphere A. Which statements can be correctly concluded about the charge on the spheres?

• A has a positive charge

• B has a negative charge

• A and B have opposite charges

• A is neutral

As shown above, two particles, each of charge +Q, are fixedat opposite corners of a square that lies in the plane of the page. A positive test charge +q is placed at a third corner. What is the direction of the force on the test charge due to the other two charges>

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Two metal spheres that are initially uncharged are mounted on insulating stands, as shown below. A negatively charged rubber rod is brought close to, but does not make contact with, sphere 1. Sphere 2 is then brought close to 1 on the side opposite to the rubber rod. 2 is allowed to touch 1 and then is removed some distance away. The rubber rod is then moved far away from 1 and 2. What are the final charges on the spheres?

• 1: Negative 2: Negative

• 1: Positive 2: Negative

• 1: Negative 2: Positive

• 1: Positive 2: Positive

If F is the magnitude of the force on the test charge (+q) due to only one of the other charges, what is the magnitude of the net force acting on the test charge due to both of these charges?

• F/√2

• F

• √2 F

• 2F

A charge q = +3.0 nC (n stands for nano which is 10^-9) is placed at a location at which the electric field strength is 400 N/C. Find the force felt by the charge q.

• 1.2 x 10^-3 N

• 1.2 x 10^-6 N

• 1.33 x 10¹¹ N

• 1.33 x 10⁸ N

The image shows two charged particles with a force of 2.4 N. What would you predict the force of interaction would be when the magnitude of charge on q2 doubles?

• 9.6 N

• 4.8 N

• 1.2 N

• .6 N

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A 500 N/C electric field points left. What is the electric force on a -2 μC charge in this field?

• 1000 μN
• 1000 μN right
• 1000 μN left
• -1000 μN

Which of the following labeled points is in the region with the strongest force of electric charge

• A
• B
• C
• D

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

What option best describes this field?

• A strong electric field generated by two positive charges. They would attract each other.
• A strong electric field generated by two positive charges. They would repel each other.
• A weak electric field generated by two opposite charges. They would attract each other.
• A weak electric field generated by two positive charges. They would repel each other.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5