Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

electricity
Asked by | 08 Dec, 2008, 12:06: PM
Expert Answer

The resistance of a wire R = ρ l/A
where ρ - resistivity of the wire(its constant for a material)
            l - Length of the wire
            A - area of the crossection

Now A = πr2 where r - radius of the cross section. If d is the diameter then  
r = d/2

Hence A = 1/4πd2

This implies R  1/A  R1/d2

i.e. if the diameter is doubled the resistance reduces to 1/4 of the original value.

Answered by | 08 Dec, 2008, 01:51: PM
Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment

Concept Videos

Application Videos

Answered Unanswered My Questions My Answers
CBSE 10 - Physics
What is the basic principle of Ohm's law?
Asked by sr558079 | 27 May, 2022, 01:40: PM
ANSWERED BY EXPERT
CBSE 10 - Physics
A wire of length 22.5 cm and resistance was 20 © and the diameter was 0. 3mm then what is the resistivity  of the material .  
Asked by hgiri2006 | 06 May, 2022, 10:28: PM
ANSWERED BY EXPERT
CBSE 10 - Physics
what is volt
Asked by dagurankur03 | 08 Apr, 2022, 09:56: AM
ANSWERED BY EXPERT
CBSE 10 - Physics
why does need to maintain the current in a given electric circuit by expanding its energy stored in it?
Asked by ragavarshinik07 | 30 Mar, 2022, 07:17: PM
ANSWERED BY EXPERT
CBSE 10 - Physics
formula of equivalent resistance in parallel and series'
Asked by priyatinsola02 | 20 Mar, 2022, 11:26: PM
ANSWERED BY EXPERT
CBSE 10 - Physics
what is formula for Resistance in series and parallel
Asked by topperlearningforcontent | 23 Feb, 2022, 11:34: AM
ANSWERED BY EXPERT
CBSE 10 - Physics
Judge the equivalent resistance when the following are connected in parallel - (a) 1 Ω and 106Ω, (b) 1Ω and 103Ω and 106Ω. can you please answer this question fast.
Asked by swatipuspapatel | 21 Feb, 2022, 07:35: PM
ANSWERED BY EXPERT
CBSE 10 - Physics
Please answer this question
Asked by tanyajain164 | 22 Jan, 2022, 09:44: AM
ANSWERED BY EXPERT
CBSE 10 - Physics
The flow of electrons is opposite to the direction of the flow of current as electron is negatively charged . Then why current is defined as the flow of electrons through the conductor though current travels from positive to negative terminal.
Asked by suneethasri83 | 01 Jan, 2022, 02:59: PM
ANSWERED BY EXPERT
CBSE 10 - Physics
If charge on one electron is 1.6 x 10 -19 C. Calculate number of electrons required to constitute 1A of current in 1s.
Asked by shashankkatekar | 28 Dec, 2021, 07:26: PM
ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt

Start your hassle free Education Franchisee and grow your business!

Know more
×