Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
RESISTIVITY:
Resistance may be defined as that property of a substance which opposes (or restricts) the flow of current (or electrons) through it. The practical as well as MKS (or SI) unit of ohm (O). 1 ohm is defined as that resistance between two points of a conductor which produces a current of one ampere. When a potential difference of 1 volt is applied to it.
If I is the current flowing through a conductor of resistance R across which a potential difference V is applied then according to ohm's law.
I=V/R
Where V is in volts, R is in the ohms and I is in amperes.
Resistance of a material is:
(a) Directly proportional to its length, l R α l
(b) Inversely proportional to its area of cross section a, Rα1/a
Combining above two facts me have R α l/a
Or R=ρl/A
Where ρ(rho) is a constant depending upon the nature of the material and is known as the specific resistance or resistivity of the material. Putting l=1 and a=1 expression we have R=ρ. Hence resistance of a material of unit length having unit cross-sectional area is defined as the resistivity.
Determine the value of ‘a' for which the vector field is solenoidal.
Where do I upload questions and answers for students?
(B) COVALENT BOND: What about reactions between two non metals? Many non metals do bond together. Hydrogen atoms, for instance, frequently react with other hydrogen
Explain the differences between heat transfer mechanisms in solids, liquids, gases (conduction, convection, radiation) Explain the combinations of substances, in terms of molecula
how does a Vernier caliper work
definition, Working principal, applications ??
A thermal imager is used to measure the temperature of a target surface (ε = 1) in the test section of a wind tunnel. The thermal imager must view the target though a window. The t
Ehrenfest paradox (Ehernfest, 1909) The special relativistic "paradox" including a quickly rotating disc. As any radial segment of the disc is perpendicular to the direction o
Inducing a Positive Charge on a Sphere The given below animation depicts the induction procedure. The neutral conducting sphere is at rest on top of an insulating stand. An unh
How do you make a model of a free body diagram for a science project?
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd