Definition of an Electric Field - Questions

Definition of an Electric Field
































Near a positive charge, the electric field points

(A) in circles around the charge.
(B) directly away from the charge.
(C) directly toward the charge.
(D) upward.

Questions --- What this question is about
80.1
































Near a positive charge, the electric field points

(A) in circles around the charge.
No. --- It points in the direction of the force on a positive charge.

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Questions --- What this question is about
80.1
































Near a positive charge, the electric field points

(B) directly away from the charge.

Yes. In the direction of the force on a positive charge.

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Questions --- What this question is about
80.1
































Near a positive charge, the electric field points

(C) directly toward the charge.

No. --- A positive charge repels positive test charges.

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Questions --- What this question is about
80.1
































Near a positive charge, the electric field points

(D) upward.

No. Which way is "up"?

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Questions --- What this question is about
80.1
































Near a negative charge, the electric field points

(A) in circles around the charge.
(B) directly away from the charge.
(C) directly toward the charge.
(D) upward.

Questions --- What this question is about
80.2































Near a negative charge, the electric field points

(A) in circles around the charge.
No. --- It points in the direction of the force on a positive charge.

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Questions --- What this question is about
80.2
































Near a negative charge, the electric field points

(B) directly away from the charge.
No. --- It points in the direction of the force on a positive charge.

Try again.
Questions --- What this question is about
80.2
































Near a negative charge, the electric field points

(C) directly toward the charge.

Yes. --- Opposite charges attract.

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Questions --- What this question is about
80.2
































Near a negative charge, the electric field points

(D) upward.

No. --- Which way is "up"?

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Questions --- What this question is about
80.2

































A baseball pitcher acquires an unbalanced electrical charge by scuffing his feet in the dirt and transfers -0.0001C to a baseball as he throws it toward home plate. A thunderstorm is brewing and there is a vertical electric field of 10,000N/C pointing straight up. The electrical force on the baseball is

(A) 0.1N upward.
(B) 0.1N downward.
(C) 1N upward.
(D) 1N downward.

Questions --- What this question is about
80.3

































A baseball pitcher acquires an unbalanced electrical charge by scuffing his feet in the dirt and transfers -0.0001C to a baseball as he throws it toward home plate. A thunderstorm is brewing and there is a vertical electric field of 10,000N/C pointing straight up. The electrical force on the baseball is

(A) 0.1N upward. --- No.

The charge is negative.

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Questions --- What this question is about
80.3

































A baseball pitcher acquires an unbalanced electrical charge by scuffing his feet in the dirt and transfers -0.0001C to a baseball as he throws it toward home plate. A thunderstorm is brewing and there is a vertical electric field of 10,000N/C pointing straight up. The electrical force on the baseball is

(B) 0.1N downward. --- No.

Multiply the charge by the force.

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Questions --- What this question is about
80.3

































A baseball pitcher acquires an unbalanced electrical charge by scuffing his feet in the dirt and transfers -0.0001C to a baseball as he throws it toward home plate. A thunderstorm is brewing and there is a vertical electric field of 10,000N/C pointing straight up. The electrical force on the baseball is

(C) 1N upward. --- No.

The charge is negative.

Try again.
Questions --- What this question is about
80.3

































A baseball pitcher acquires an unbalanced electrical charge by scuffing his feet in the dirt and transfers -0.0001C to a baseball as he throws it toward home plate. A thunderstorm is brewing and there is a vertical electric field of 10,000N/C pointing straight up. The electrical force on the baseball is

(D) 1N downward. --- Yes.

F = (-0.0001C)(10,000N/C) = -1N

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Questions --- What this question is about
80.3