Combination of Resistors: Practice Problem & Solution
Assertion (A): The bending of an insulated wire increases the resistance of wire. Reason (R): The drift velocity of electrons in bent wire decreases.
Solution Explained:
To solve this problem, we apply the core principles of Combination of Resistors. Understanding the underlying formula is key to arriving at the correct answer below:
Resistance of a wire \( R = \rho \frac{L}{A} \) primarily depends on its resistivity \( rho \), length \( L \), and cross-sectional area \( A \). Bending an insulated wire does not significantly alter these properties, so its resistance does not increase. Drift velocity is not affected by bending either. Therefore, both (A) and (R) are false.
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