21. Study the I-V graph for four conductors A, B, C and D having resistance Ra, RB, Rc and RD
respectively, and answer the following questions:
a ) Which one of these is the best conductor?
b) If all the conductors are of same length and same material, which is the thickest?
c) If all the conductors are of same thickness and of same material, which is the longest?
d) If the dimensions of all the conductors are identical, but their materials are different,
which one would you use as a resistance wire (by connecting wire?
f) If conductors A and B are connected in series and I-V graph is plotted for the
combination, its slope would be
i) less than that of A
ii) more than that of A.
iii) between A and B.
iv) more than that of D
g) If conductors C and D are connected in parallel and I-V graph is plotted for the
combination, its slope would be
i) lesser than that of A.
ii) more than that of D.
iii) between C and D.
iv) between B and C.
Answers
(a). The best conductor is D .
(b). If all the conductors are of same length and same material, D is the thickest.
(c). A is the longest , if all the conductors are of same thickness and of same material .
(d). If materials are different , A should be used as a resistance wire and D should be used as a connecting wire .
(f). The slope would be (i) less than that of A .
(g). If conductors C and D are connected in parallel and I-V graph is plotted for the combination, its slope would be (ii) more than that of D .
Answer:
(a). The best conductor is D .
(b). If all the conductors are of same length and same material, D is the thickest.
(c). A is the longest , if all the conductors are of same thickness and of same material .
(d). If materials are different , A should be used as a resistance wire and D should be used as a connecting wire .
(f). The slope would be (i) less than that of A .
(g). If conductors C and D are connected in parallel and I-V graph is plotted for the combination, its slope would be (ii) more than that of D .
*THIS QUESTION CAN COME AS A CASE STUDY AS PER CBSE latest marking scheme so PLEASE UNDERTAND THE REASON FOR EACH PART separately*