Question

Study the V-I graph for four conductors A,B,C and D having resistance RA, RB, RC and RD
respectively, and answer the following questions :
(i) Which one of these is a best conductor ?
(ii) If all the conductors are of same length and same material, which is the thickest ?
(iii) If all the conductors are of same thickness and of same material which is the longest ?
(iv) If the dimensions of all the conductors are identical, but their materials are different
which one would you use as
(a) resistance wire (b) connecting wire
(v) Which one of the following relations is true for these conductors
(a) RA >RB>RC>RD (b) RA Page 6 of 18
(c) RA 5RB5RC5RD (d) RA = RB< RC (vi) If conductors A and B are connected in series and V-I graph is plotted for the
combination, its slope would be
(a) Less than that of A (b) more than that of A
(c) between A and B (d) Stat
(vii) If conductors C and D are connected in parallel and V-I graph is plotted for the
combination, its slope would be
(a) Lesser than that of A (b) More than that of D
(c) Between C and D (d) Between B and C

Answer 1

1)D is the best conductor

2)D will be the thickest

3) A will be the longest

4)A will be used as a connecting wire and D as resistance wire

Answer 2

Answer:

From the graph, we can conclude that D is the best conductor of electricity, and is the thickest.
A is the longest and can be used as the connecting wire, while D can be used as the resistance wire.

Explanation:

From the graph, we can analyze and conclude the following -

• D has the lowest resistance, and thus, is the best conductor.
• D will be the thickest among all other materials, if all of them have the same length, because thickness (the square) is inversely proportional to the material's resistance.
• A will be the longest, because it has the highest resistance, too. Resistance is directly proportional to the length of the material, like we already know.
• The connecting wires need to have the highest resistance, and thus A can be used. While, D needs to be used as a resistance wire, since it has the lowest resistance, and thus, the most sensitive to it.

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