When $$5V$$ potential difference is applied across a wire of length $$0.1$$ $$m,$$ the drift speed of electrons is $$2.5 \times {10^{ - 4}}\,\,m{s^{ - 1}}.$$ If the electron density in the wire is $$8 \times {10^{28}}\,\,{m^{ - 3}},$$ the resistivity of the material is close to :

$$1.6 \times {10^{ - 5}}\Omega m$$

A conducting wire of length 'l', area of cross-section A and electric resistivity $$\rho$$ is connected between the terminals of a battery. A potential difference V is developed between its ends, causing an electric current. If the length of the wire of the same material is doubled and the area of cross-section is halved, the resultant current would be :

$${1 \over 4}{{VA} \over {\rho l}}$$

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JEE Main Ohms Law Questions with Answers and Solutions

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JEE Main Ohms Law practice

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A uniform metallic wire carries a current 2 A, when 3.4 V battery is connected across it. The mass of uniform metallic wire is 8.92

\times

10$$^{-3}$$ kg, density is 8.92

\times

10$$^{3}$$

kg / m

$$^3$$ and resistivity is 1.7

\times

10$$^{-8}~\Omega$$-

\mathrm{m}

. The length of wire is :

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JEE Main Ohms Law practice

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JEE Main Ohms Law practice FAQ

Prepare together, not alone

JEE Main Ohms Law practice

What visitors can use on this page

JEE Main Ohms Law practice FAQ