Question 138: Current Electricity

Question

The variation of applied potential and current flowing through a given wire is shown in figure. The length of wire is 31.4 cm. The diameter of wire is measured as 2.4 cm. The resistivity of the given wire is measured as x $$	imes$$ 10
$$-$$3
$$\Omega$$ cm. The value of x is ____________. [Take $$\pi$$ = 3.14]

Accepted Answer

Resistance $$ = 	an 45^\circ  = 1\,\Omega $$
$$ \Rightarrow 1 = {{pI} \over A}$$
$$ \Rightarrow p = {{\pi {{(1.2\,cm)}^2}} \over {31.4\,cm}} = 1.44 	imes {10^{ - 1}}$$ $$\Omega$$ cm
$$ \Rightarrow x = 144$$

Current Electricity

The variation of applied potential and current flowing through a given wire is shown in figure. The length of wire is 31.4 cm. The diameter of wire is measured as 2.4 cm. The resistivity of the given wire is measured as x $\times 10 -3 \Omega cm. The value of x is ____________. [Take \pi$ = 3.14]

Integer / Numeric Answer Type