If the length and diameter of a conductor both are halved, the resistance of the conductor becomes …………………….
A) 4 times
B) doubled
C) does not change
D) halved
1 Answers
Talk Doctor Online in Bissoy App
The wire of length L and resistance R is stretched so that its radius of cross-section is halved. What is its new resistance?
Correct answer is (D) 16R
2 Answers 1 views
A fraction becomes 4/5, if 1 is added to both numerator and denominator. If, however, 5 is subtracted from both numerator and denominator, the fractio
Correct Answer - ` (7)/(9)`
2 Answers 1 views
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 = \(\frac{100(R-95.2)}{(138.6-95.2)}\) ∴...
2 Answers 3 views
Keeping the p.d constant, the resistance of a circuit is halved. The current will become
Correct option is D) double
2 Answers 1 views
The resistance of a conductor …………………. when the length of a conductor increased for providing constant temperature and cross-sectional area.
B) increases
2 Answers 1 views
If the diameter of a resistance wire is halved then its resistance becomes ………………………….
Correct option is A) four times
2 Answers 1 views
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)] =...
2 Answers 3 views
The drift velocity of the free electrons in a conductor is independent of (A) length of the conductor.
(A) length of the conductor.
2 Answers 1 views
If the length of a conductor is halved, then its conductivity will be
Correct option is: (D) unchanged
2 Answers 1 views
If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (L) and cross-sectional area A shall be respectively
Correct option is: (A) L/3 and 4 A
2 Answers 3 views