Electric field

What is the unit of electric field?

• C

• N/C

• C/N

• Cm

What is the equation for the electric field of a point charge?

What is the direction of electric field at a given point?

• It has same direction as the force experienced by a negative charge at a given point.

• It has same direction as the force experienced by a positive charge at a given point.

• It depends on the sign of charge.

• It always points towards the center of the charge.

Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.

• +,+

• +,-

• -,+

• -,-

At which point is the electric field the strongest

• A
• B
• C
• D

Which of the following is a true statement about the electric field between the two plates?

• The field is attractive between the plates and uniform in strength

• The field is repulsive between the plates and uniform in strength

• The field is attractive between the plates and strongest near the positive

• The field is repulsive between the plates and strongest near the positive

Based on the arrangement of the electric field lines in the diagram, what are the charges?

• both charges are the same

• the charges are opposite

• they are neutral; no charge

The electric field surrounding a positively charged object is

• Away from the charge
• Toward the charge

which is the field for opposite charges

• 
• 
• 
• 

A point charge Q is far from all other charges. At a distance of 2 m from Q, the electric field is 20 N/C. What is the force a charge of 5 Coulombs feels?

• 4 N
• 100 N
• 40 N
• 10 N