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.
Q. For projectiles fired at identical speeds but a variety of angles from the ground, neglecting air resistance also the curvature of the Earth at what angle will the maximum horiz
Derive a mathematical expression for the magnetic induction at a point on the axial line of a bar magnet. Derive a mathematical expression for the magnetic induction at a point
An automobile fuel tank is filled to the brim with45 L of gasoline (12 gal) at 20°C.Immediately afterward, the vehicle is parked in the sunlight, where the temperature is 45°C. How
The rope shown in the figure attached hereto is wound around a cylinder of of mass 4.0 kg, radius 10cm and I=0.020kgm2 , where I is the moment of inertia about an axis along the cy
types of lenses and their explanation
Q. State the fundamental postulates of special theory of relativity? The two basic postulates of the special theory of relativity are: (i) The laws of Physics are the simila
Can an ordinary diode be used as a zener diode? Justify your answer. Ans Ordinary diode can't be used as a Zener diode, since ordinary diodes aren't operated in the rever
A iron rod on the surface of the beach and other iron rod into the sea water which metal corrodes easily? Ans) An iron rod on the surface of teh seawater because in sea it contains
The Trigger In particle physics, a trigger is a system which uses easy criteria to rapidly decide that events within a particle detector to remain while only a small fraction o
A locus formed by joining the points which are at the equal distance from the source....is called wavefront...
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd