| Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as: |
| Assertion (A): Bending a wire does not effect electrical resistance. |
| Reason (R): Resistance of wire is proportional to resistivity of material. |
A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
C) Assertion (A) is true but Reason (R) is false
D) Assertion (A) is false and Reason (R) is also false
Correct Answer: A
Solution :
(a) Resistance of wire \[R=\rho \frac{l}{A}\] where \[\rho \] is resistivity of material which does not depend on the geometry of wire. Since, when wire banded, resistivity, length and area of cross-section do not change, therefore resistance of wire also remain same.
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