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Electric Fields — Quiz Answers

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1
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What is the strength of the electric field 0 point 0 2 0 m from a 12 mu cap c charge? (Use k is equal to 8 point 9 9 times 10 to the 9th power cap n the fraction with numerator m squared and denominator cap c squared )

A
2 point 7 times 10 to the 8th power cap n over cap c
B
5 point 4 times 10 to the 12th power cap n over cap c
C
5 point 4 times 10 to the 6th power cap n over cap c
D
2 point 7 times 10 to the 14th power cap n over cap c
2
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Which best describes the electric field created by a positive charge?

A
Its rays point toward the charge.
B
Its rays point away from the charge.
C
It circles clockwise around the charge.
D
It circles counterclockwise around the charge.
3

What formula gives the strength of an electric field, cap e , at a distance from a known source charge?

A
cap e is equal to the fraction with numerator cap f sub e and denominator d
B
cap e is equal to the fraction with numerator k q and denominator d squared
C
cap e is equal to k q over d
D
cap e is equal to the fraction with numerator cap f sub e and denominator q d
4

Which statements about electric field lines are correct? Choose three correct answers.

A
They point toward a negative charge.
B
They point away from a positive charge.
C
They point away from a negative charge.
D
They cross over one another between charges.
E
They never cross.
F
They point toward a positive charge.
5

A source charge generates an electric field of 4286 cap n over cap c at a distance of 2 point 5 m What is the magnitude of the source charge? (Use k is equal to 8 point 9 9 times 10 to the 9th power cap n the fraction with numerator m squared and denominator cap c squared )

A
3 point 0 mu cap c
B
3 point 0 cap c
C
1 point 2 mu cap c
D
1 point 2 cap c
6

What is the direction of the electric field at a point directly below a negative charge, Q ?

A
left
B
up
C
down
D
right
7

Electric field lines can never cross. What would crossed electric field lines indicate?

A
an attractive force on a charge
B
a field pointing in two directions
C
a nonuniform area of the field
D
a place where the field strength is zero
8

What is the direction of the electric field at a point directly to the left of a positive charge, Q ?

A
right
B
up
C
down
D
left
9

A negative test charge experiences a force to the right as a result of an electric field. Which is the best conclusion to draw based on this description?

A
No conclusion can be drawn because the amount of charge on the test charge is unknown.
B
No conclusion can be drawn because the sign of the charge creating the field is unknown.
C
The electric field points to the right because the force on a negative charge is in the same direction as the field.
D
The electric field points to the left because the force on a negative charge is opposite to the direction of the field.
10

A source charge generates an electric field of 1236 cap n over cap c at a distance of 4 m What is the magnitude of the source charge? (Use k is equal to 8 point 9 9 times 10 to the 9th power cap n the fraction with numerator m squared and denominator cap c squared )

A
2 point 2 mu cap c
B
680 mu cap c
C
2 point 2 cap c
D
680 cap c

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Electric Fields — Quiz Answers — Physics