Q11 of 52 Page 382

Aluminium wire has radius 0.25 mm and length or 75 m. If the resistance of the wire is 10Ω, calculate the resistivity of aluminium.

The formula of resistance is:

Where, resistivity


Length of the conductor


A = Area of the conductor



Here:


R = 10


r = 0.25mm


l = 75m


We know that the area of the wire will be:




Putting the given values in the above formula,




More from this chapter

All 52 →
9

What kind of graph is obtained by plotting values of V and I? Why?

 10

It is possible to replace resistors joined in series by an equivalent single resistor of resistance. How?

 12

You are given three resistors each of 3Ω and you are asked to get all possible values of resistance when you connect them in different combinations. How many values of resistance can you get?

 13

Find the current drawn from the battery by network of four resistors shown in the figure?