A uniform wire of resistance 50 Ω is cut into five equal parts. These parts are now connected in parallel. Then the equivalent resistance of the combination is …………………….
A) 2 Ω
B) 12 Ω
C) 250 Ω
D) 6250 Ω
1 Answers
Talk Doctor Online in Bissoy App
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
2 Answers 3 views
A resistance of `2Omega` is connected across one gap of a metre-bridge(the length of the wire is 100 cm) and an unknown resistance, greater than `2Ome
Answer A) 3 ohm Soln-: 2/x=y/(100-x) 200-2x=xy ......1 After interchanging Y/x+20 = 2/(80-x) 80y-xy=2x+40 .......2 On solving equation 1 and 2 Y=3 ohm
2 Answers 1 views
The diameter of a copper sphere is 18 cm. It is melted and drawn into a long wire of uniform cross section. If the length of the wire is 108 m, find i
Correct Answer - 0.6 cm
2 Answers 1 views
A steel wire is acted upon by a load of 10 N. Calculate the extension produced in the wire, if the strain energy stored in the wire is 1.1 × 10^-3 J.
Given: F = 10 N, Strain energy = 1.1 × 10-3 J, To find: Extension (l) Formula: W = \(\frac{1}{2}\) × F × l Calculation: From formula, l = \(\frac{2\,W}{F}=\frac{2\times1.1\times10^{-3}}{10}\) = 2.2 × 10-4 m. The extension produced in the wire is...
2 Answers 4 views
A uniform wire of resistance 100 Ω is melted and recast into wire of length double that of the
Correct option is A) 400 Ω
2 Answers 1 views
A 100 Ω resistance is cut into five equal parts and are connected in parallel. The equivalent resistance is …………………..
Correct option is C) 4 Ω
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
Given a current carrying wire of non-uniform cross-section. Which of the following is constant throughout the length of the wire?
Correct option is: (D) Current only
2 Answers 1 views
A bar magnet is cut into two equal parts vertically and half part of bar magnet is kept on the other such that opposite poles align each other.
When bar magnet is cut into two equal parts, then magnetic moment of each part becomes half of the original directed from S to N pole. ∴ Magnetic moment of the combination...
2 Answers 1 views
The emf of a cell is `Ev`, and its its internal resistance is `1Omega`. A resistance of `4Omega` is joined to battery in parallel. This is connected i
Correct Answer - C `r=R[(l_(1)-l_(2))/(l_(2))]`
2 Answers 1 views