Section 2: Multiple Correct For each item below. choose all responses that corre

Question

Section 2: Multiple Correct For each item below. choose all responses that correctly answer the question. There will be more than one correct answer for each question. Note that several questions may refer back to a single diagram. 2n 4n 10. Which arrangements of resistors shown above have the same resistance between the terminals? Select two answers. (A) I (D) IV 11. Two conducting cylindrical wires are made out of the same material. Wire x has twice as much resistance than wire Y. Which of the following could be true? Select two answers. (A) Wire X has the same length and twice the diameter of wire Y. Wine X is twice as long and twice the diameter of wire Y. PR) Wire Y is twice as long and twice the diameter of wire X. MD) Wire X is twice as long and has the same diameter as wire Y.

Explanation / Answer

10)

A and D

arrangement I  , the two resistor 1 +1 are in series and add up result = 2 ohm

arrangment IV has 4 and 4 in parallel the result is

1/R = 1/4 + 1/4 => r = 2 ohm

both arrangments have same resistance across the terminals

11)

X has twice the rsistance as that of Y

Rx = 2 Ry

R = r* l/A     

r - is resistivity and is sam for both X and Y as the material is same

A = pi*D2/4

lx /Ax   = 2ly/Ay

lx/Dx2 =2 ly/Dy2

A) lx = ly => 2Dx2 = Dy2 , the option is wrong it must be square

D) lx = 2ly => Dx = Dy

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