The length of a certain wire is kept same while its radius is doubled. What is t

Question

The length of a certain wire is kept same while its radius is doubled. What is the new resistivity of this wire? As a proton moves in the direction the eclectic field lines If a quantity you calculated has units of A s. What is that quantity? The electric potential at a distance of 4 m from a certain point charge is 200 v relative to infinity. What is the potential (relative to infinity) at a distance of 2m from the same charge? If a quantity you calculated has units of what is that quantity? The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire? What is the voltage drop across a 6.0- resistor if the current through it is 6.0 A? Which one of the following quantities is equivalent to 1 ? You are given a copper bar of dimensions 3 cm times 5 cm times 8 cm asked to attach leads to it in order to make a resistor. If you want to achieve the smallest possible resistance, you should attach the leads to the opposite faces that measure

Explanation / Answer

17) Resistivity will remain the same

18)Proton moves from high potential to low potential and lose potential energy.

19)Charge is given by q=Ixt. So the unit would be A.s

20) Potential is inveresly proportional to radius. So the answer is B) = 400V as radius is halved.

21)Resistivity

22)By ohm's law Voltage drop = 1V

23)It would be reduced ba a factor of 4

24) C) 1V/A

25)The resistance would be lowest in the one with minimum area i.e 5x8 face.

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