Definition of Electric Potential - Questions

Definition of Electric Potential
































In the MKS system of units, the volt is defined by

(A) 1V = 1N/C.
(B) 1V = 1J/C
(C) 1V = 1C/N
(D) 1V = 1C/J

Questions --- What this question is about
83.1
































In the MKS system of units, the volt is defined by

(A) 1V = 1N/C. --- No.
That is the unit of field strength.

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Questions --- What this question is about
83.1
































In the MKS system of units, the volt is defined by

(B) 1V = 1J/C --- Yes.
energy per unit charge.

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Questions --- What this question is about
83.1
































In the MKS system of units, the volt is defined by

(C) 1V = 1C/N --- No.
Electrical units are things per charge.

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Questions --- What this question is about
83.1
































In the MKS system of units, the volt is defined by

(D) 1V = 1C/J --- No.
Electrical units are things per charge.

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Questions --- What this question is about
83.1
































The potential energy of a charge of 3 micro-coulombs in a potential of 2 million volts is

(A) 1J. (B) 2J. (C) 3J. (D) 6J.



Questions --- What this question is about
83.2
































The potential energy of a charge of 3 micro-coulombs in a potential of 2 million volts is

(A) 1J. --- No.

Calculate the answer.

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Questions --- What this question is about
83.2
































The potential energy of a charge of 3 micro-coulombs in a potential of 2 million volts is

(B) 2J. --- No.

Multiply the numbers together.

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Questions --- What this question is about
83.2
































The potential energy of a charge of 3 micro-coulombs in a potential of 2 million volts is

(C) 3J. ---No.

Multiply the numbers together.

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Questions --- What this question is about
83.2
































The potential energy of a charge of 3 micro-coulombs in a potential of 2 million volts is

(D) 6J. --- Yes.

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Questions --- What this question is about
83.2
































The electric potential of a point is defined only if

(A) the point is in contact with matter.
(B) there is unbalanced charge at the point.
(C) the position of the point is defined.
(D) unbalanced charge is near the point.

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The electric potential of a point is defined only if

(A) the point is in contact with matter.

No. Contact is not needed.

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Questions --- What this question is about
83.3
































The electric potential of a point is defined only if

(B) there is unbalanced charge at the point.

No. Charge is not needed.

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Questions --- What this question is about
83.3
































The electric potential of a point is defined only if

(C) the position of the point is defined.

Yes, Electric potential is a property of space alone.

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Questions --- What this question is about
83.3
































The electric potential of a point is defined only if

(D) unbalanced charge is near the point.

No. Unbalanced charge is not needed.

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Questions --- What this question is about
83.3

































Subway cars sometimes get their power from a "third rail" which is at a potential of about 600V above the potential of the other two rails (which are connected to the ground). If you are unfortunate enough to find yourself on the tracks of such a subway, which of the following situations is the most dangerous.

(A) both feet on a grounded rail.
(B) both feet on the third rail.
(C) one foot on the third rail and one foot on another rail.


Questions --- What this question is about
83.4

































Subway cars sometimes get their power from a "third rail" which is at a potential of about 600V above the potential of the other two rails (which are connected to the ground). If you are unfortunate enough to find yourself on the tracks of such a subway, which of the following situations is the most dangerous.

(A) both feet on a grounded rail.

No. No potential difference, no problem.

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Questions --- What this question is about
83.4

































Subway cars sometimes get their power from a "third rail" which is at a potential of about 600V above the potential of the other two rails (which are connected to the ground). If you are unfortunate enough to find yourself on the tracks of such a subway, which of the following situations is the most dangerous.

(B) both feet on the third rail.

No. No potential difference, no problem.

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Questions --- What this question is about
83.4

































Subway cars sometimes get their power from a "third rail" which is at a potential of about 600V above the potential of the other two rails (which are connected to the ground). If you are unfortunate enough to find yourself on the tracks of such a subway, which of the following situations is the most dangerous.

(C) one foot on the third rail and one foot on another rail.

Yes. 600V potential difference between feet is unhealthy.

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Questions --- What this question is about
83.4