Question

A potential difference V applied across a conductor at 0°C leads to a certain current in the conductor. If temperature of the conductor is raised by 400°C, a potential difference 2 V is required to keep the current same as before. The temperature coefficient of resistance of the conductor is (Neglect thermal expansions)

Answer 1

Answer:

A potential difference V applied across a conductor at 0°C leads to a certain current in the conductor. If temperature of the conductor is raised by 400°C, a potential difference 2 V is required to keep the current same as before. The temperature coefficient of resistance of the conductor is (Neglect thermal expansions)  2.5 ×10–3 K–1

Explanation:

V = IR and R = R0 (1 + αΔT)

Sol. : V = IR

As I is constant

V ∝ R

⇒ R2 = 2R1 = R1 (1 + α(400))

⇒ 2 = 1+ α(400)

α = 2.5 ×10–3 K–1

Answer 2

$\huge\mathfrak\red{ANSWER}$

A potential difference V applied across a conductor at 0°C leads to a certain current in the conductor. If temperature of the conductor is raised by 400°C, a potential difference 2 V is required to keep the current same as before. The temperature coefficient of resistance of the conductor is (Neglect thermal expansions)

a= 2.6×10-3K-1