EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electric Current Through Conductors>MHT-CET 2018>Q 2

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IMPORTANT

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A conducting wire has length $L_{1}$ and diameter $d_{1}$ . After stretching the same wire length becomes $L_{2}$ and diameter $d_{2}$ . The ratio of resistance before and after stretching is

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Important Questions on Electric Current Through Conductors

MEDIUM

MHT-CET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electric Current Through Conductors>MHT-CET 2017>Q 1

The resistivity of potentiometer wire is

40 \times 10^{- 8} Ω m

and its area of cross-section is

8 \times 10^{- 6} m^{2}

. If

0.2 A

current is flowing through the wire, the potential gradient of the wire is

MEDIUM

MHT-CET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electric Current Through Conductors>MHT-CET 2018>Q 2

A conducting wire has length

L_{1}

and diameter

d_{1}

. After stretching the same wire length becomes

L_{2}

and diameter

d_{2}

. The ratio of resistance before and after stretching is