EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2019 Paper 1 General Ability Test>Q 10

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IMPORTANT

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Let us consider a copper wire having radius $r$ and length $l .$ Let its resistance be $R .$ If the radius of another copper wire is $2 r$ and the length is $l / 2,$ then the resistance of this wire will be

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Important Questions on Current Electricity

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NDA & NA EE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2019 Paper 1 General Ability Test>Q 11

Two metallic wires

A

and

B

are made using copper. The radius of wire

A

is

r

while its length is

l .

A DC voltage

V

is applied across the wire

A,

causing power dissipation

P .

The radius of wire

B

is

2 r

and its length is

2 l

and the same DC voltage

V

is applied across it causing power dissipation

P_{1} .

Which one of the following is the correct relationship between

P

and

P_{1} ?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2019 Paper 1 General Ability Test>Q 12

A fuse wire must be___.