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Electricity

See attached file for figure connected with question 24.

1) The materials with the lowest resistance are called
A) conductors
B) superconductors
c) semiconuctors
D) insulators

2) An electron is moved from point A to point B along an equipotential surface.
A) The electron performs work in moving from point A to point B.
B) Work is required to move the electron from point A to point B.
C) Work is both required and performed in moving the electron from
point A to point B.
D) No work is required to move the electron from point A to point B.

3) The resistance of a wire
A) depends on its length
B) depends on its thickness
C) depends on temperature
D) all of the above

4) A proton is moved from point A to point B along an equipotential surface.
A) The proton's potential energy increases as it is moving from point A to point B.
B) The proton's potential energy decreases as it is moving from point A to point B.
C) The proton's potential energy stays constant as it is moving from point A to point B.

5) A neutron is moved from point A to point B along an equipotential surface.
A) The neutron's potential energy increases as it is moving from point A to point B.
B) The neutron's potential energy decreases as it is moving from point A to point B.
C) The force exerted on the neutron changes as it is moving from point A to point B.
D) None of the above.

6) You have two identical resistors 50kΩ each and a 1.5 V battery. Which of the following statements are true
A) the current drawn is bigger if the resistors are in series
B) the current drawn is bigger if the resistors are in parallel
C) the voltage across each resistor is bigger if the resistors are in series
D) the voltage across each resistor is smaller if the resistors are in series

7) As a neutron moves along the electric field line
A) its potential decreases
B) its potential increases
C) its potential doesn't change

8) The electric field shown (see attached doc file)

A) increases to the right.
B) increases down.
C) decreases to the right.
D) decreases down.
E) is uniform.

9) If an atom became a negative ion then
A) at least one electron was removed from it
B) at least one electron was added to it
C) at least one neutron was removed from it
D) at least one proton was added to it

Attachments

Solution Preview

Answers are listed below and (same information) in attached pdf file.

17) The materials with the lowest resistance are called
A) conductors
B) superconductors
c) semiconuctors
D) insulators

Answer: B) superconductors. Superconductors have higher conductivity (lower resistance) than any other type of material.

18) An electron is moved from point A to point B along an equipotential surface.
A) The electron performs work in moving from point A to point B.
B) Work is required to move the electron from point A to point B.
C) Work is both required and performed in moving the electron from
point A to point B.
D) No work is required to move the electron from point A to point B.

Answer: D) no work is required. An equipotential surface means the potential is the same everywhere. Since the electron has the same potential at A as at B, no work was done.

19) The resistance of a wire
A) depends on its length
B) ...

Solution Summary

Answers to these multiple choice questions are given with detailed explanations. pdf file of solution is also included.

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