Electrical resistance of a conductor was first determined by
A) Coloumb
B) Faraday
C) George simon Ohm
D) Ampere
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A copper wire has a resistance of \( 0.60 hm \). Anozner copper wire of the samemass as the first one is dou ble in length of the first. Find the resistance of the second wire.
We know that R = ρl/A R ∝ l R1/R2 = l1/l2 Given ∵ l2 = 2l1 R1 = 0.60 hm R2/R1 = l2/l1 R2/R1 = 2l1/l1 R2 = 2 R1 R2 = 2 x 0.60 R2 = 1.2 hm
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A resistance thermometer has resistance 95.2 Ω at the ice point and 138.6 Ω at the steam point. What resistance would be obtained
Here the thermometric property P is the resistance. If R is the resistance at 27 °C, Using equation, T = \(\frac{100(P_T-P_1)}{(P_T-P_1)}\) For T = 27 °C, P1 = 95.2 Ω, P2 = 138.6 Ω . ∴ 27 = \(\frac{100(R-95.2)}{(138.6-95.2)}\) ∴...
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The net charge flowing through a crosssection of a conductor in unit time is …………………. when the conductor is in open circuit.
Correct option is D) zero
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The substance having infinitely high electrical resistance is called ………………..
Correct option is D) insulator
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The electrical resistance of a conductor depends on …………………….
D) a, b, c and d
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The resistance of a conductor …………………. when the length of a conductor increased for providing constant temperature and cross-sectional area.
B) increases
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If the length and diameter of a conductor both are halved, the resistance of the conductor becomes …………………….
Correct option is D) halved
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Explain the concept of electrical conduction in a conductor.
1. Electrical conduction in a conductor is due to mobile charge carriers (electrons). 2. These conduction electrons are free to move inside the volume of the conductor. 3. During their random motion,...
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A piece of platinum wire has resistance of 2.5 Ω at 0 °C. If its temperature coefficient of resistance is 4 × 10^-3/°C. Find the resistance
Given: R0 = 2.5 Ω α = 4 × 10-3/°C = 0.004/°C T = 80 °C To find: Resistance at 80 °C (RT) Formula: RT = R0(l + αT) Calculation: From formula, RT = 2.5 [1+ (0.004 × 80)] =...
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The drift velocity of the free electrons in a conductor is independent of (A) length of the conductor.
(A) length of the conductor.
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