Which of the following best describes electrical flux through a defined surface

Question

Which of the following best describes electrical flux through a defined surface area?

A. The closed surface area of the product of the electrical field and the surface area normal to said electrical field through which the field flows.

B. The product of a scalar potential field and a surface area normal to said potential field through which the field flows.

C. The scaled charge producing an electrical field flowing through any enclosed Gaussian surface.

D. The total scaled charge enclosed in a Gaussian surface producing an electrical field.

E. Two of the above answers are equivalent.

2. If a 10 C charge is placed in a potential field with a value of -10 V. The potential field is produced by a point charge. How much work will the electrical force producing the potential field do, if the 10 C charge is moved away to a distance approaching infinity?

A. 10 J

B. -10 J

C. 100 J

D. -100 J

E. 0 J

3. Why do we say that potential difference is a relative term?

A. Because the quantity does not require an absolute frame of reference for potential.

B. Because there is no such thing as 0 V.

C. Because the earth’s potential (called ground) maintains 0 V.

D. Because all units in physics are relative.

E. Because we have not yet discovered a absolute frame of reference for electrical potential

Explanation / Answer

E. Two of the above answers are equivalent.

Both C and D means the same.

Since, phi = Q(elclosed)/e0

2)C.100 J

explanation

We know that,

W = q (V2 - V1) = 10 ( 0 - -10) = 100 J

3)C. Because the earth’s potential (called ground) maintains 0 V.

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