What will be the resistance of a metal wire of length $2$ metres and area of cross-section $1.55 \times 10m $, if the resistivity of the metal be $2.8 \times 10 m?$
Download our app for free and get started
$I = 2m$
$A = 1.55 \times 10^{-6} m^2$
$P = 2.8 \times 10^{-8}m$
$\text{R}=\text{P}\frac{\text{I}}{\text{A}}$
$=2.8\times10^{-8}\times\frac{2}{1.55\times10^{-6}}$
$0.036\Omega$
$A = 1.55 \times 10^{-6} m^2$
$P = 2.8 \times 10^{-8}m$
$\text{R}=\text{P}\frac{\text{I}}{\text{A}}$
$=2.8\times10^{-8}\times\frac{2}{1.55\times10^{-6}}$
$0.036\Omega$
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1View SolutionWhat is the resistance between A and B in the figure given below?
- 2View SolutionWhat is a voltmeter? How is a voltmeter connected in the circuit to measure the potential difference between two points. Explain with the help of a diagram.
- 3Two resistances when connected in parallel give resultant value of $2$ ohm; when connected in series the value becomes $9$ ohm. Calculate the value of each resistance.View Solution
- 4Calculate the work done in moving a charge of $4$ coulombs from a point at $220$ volts to another point at $230$ volts.View Solution
- 5View SolutionCalculate the cost of operating a heater of 500W for 20hours at the rate of? ₹3.90 per unit.
- 6Calculate the resistance of an aluminium cable of length $10\ km$ and diameter $2.0\ mm$ if the resistivity of aluminium is $2.7\times10 Ω\ \text{m}.$View Solution
- 7View SolutionThree 2V cells are connected in series and used as a battery in a circuit.
- What is the p.d. at the terminals of the battery?
- How many joules of electrical energy does 1C gain on passing through
- One cell.
- All three cells?
- 8A wire is 1.0m long, 0.2mm in diameter and has a resistance of $10Ω.$ Calculate the resistivity of its material?View Solution
- 9The electrical resistivities of four materials $A, B, C$ and $D$ are given below:View Solution
$\text{A}\ -110\times10^{-8}\Omega\text{ m}$
$\text{B}-\ 1.0\times10^{10}\Omega\text{ m}$
$\text{C}-\ 10.0\times10^{-8}\Omega\text{ m}$
$\text{D}-\ 2.3\times10^{3}\Omega\text{ m}$
Which material is:- Good conductor.
- Resistor.
- Insulator, and
- Semiconductor
- 10View SolutionAn electric heater is connected to the 230V mains supply. A current of 8A flows through the heater.
- How much charge flows around the circuit each second?
- How much energy is transferred to the heater each second?