11) For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

11) ______

A) resistivity

B) 1/(resistivity)

C) power

D) current

E) 1/(current)

12) For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

12) ______

A) power

B) resistivity

C) 1/(current)

D) 1/(resistivity)

E) current

13) You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the *smallest* possible resistance, you should attach the leads to the opposite faces that measure

13) ______

A) 5 cm × 8 cm.

B) 3 cm × 8 cm.

C) 3 cm × 5 cm.

D) Any pair of faces produces the same resistance.

14) You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the *largest* possible resistance, you should attach the leads to the opposite faces that measure

14) ______

A) 3 cm × 8 cm.

B) 3 cm × 5 cm.

C) 5 cm × 8 cm.

D) Any pair of faces produces the same resistance.

15) Copper wire #1 has a length *L* and a radius *b*. Copper wire #2 has a length 2*L* and a radius 2*b*. Which statement about the resistance across the ends of the wires is true?

15) ______

A) The resistance of wire #1 is half that of wire #2.

B) The resistance of wire #1 is twice as high as that of wire #2.

C) The resistance of wire #1 is equal to that of wire #2.

D) The resistance of wire #1 is four times higher than that of wire #2.

16) The figure shows a graph of the resistance of a wire as a function of its length. What physical quantities does the slope of this graph represent?

16) ______

A) the reciprocal of the resistivity of the material

B) the product of the resistivity and the cross–sectional area of the wire

C) the resistivity of the material divided by the cross–sectional area of the wire

D) the resistivity of the material of which the wire is made

E) the cross–sectional area of the wire

17) A wire of resistivity ρ must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must

17) ______

A) be one–half the original diameter.

B) be two times the original diameter.

C) be the same as the original diameter.

D) be four times the original diameter.

E) be one–fourth the original diameter.

18) The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?

18) ______

A) It is reduced by a factor of 4.

B) It is reduced by a factor of 2.

C) It is increased by a factor of 2.

D) It is increased by a factor of 4.

E) It is reduced by a factor of 8.

19) The length of a certain wire is kept same while its radius is doubled. What is the new resistivity of this wire?

19) ______

A) It is reduced by a factor of 2.

B) It does not change.

C) It is reduced by a factor of 4.

D) It is increased by a factor of 4.

E) It is increased by a factor of 2.

20) The length of a certain wire is doubled while its radius is kept constant. What is the new resistance of this wire?

20) ______

A) It stays the same.

B) It is 2 times as large.

C) It is ½ as large.

D) It is 4 times as large.

E) It is 3 times as large.

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