Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 3 - Current Electricity>Exercise#1>Q 14

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IMPORTANT

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Specific resistance of a wire depends on its

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Important Questions on Current Electricity

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 3 - Current Electricity>Exercise#1>Q 15

The electric current passes through a metallic wire produces heat because of

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 3 - Current Electricity>Exercise#1>Q 16

For a metallic wire, the ratio

\frac{V}{i}

(

V

is applied potential difference and

i

is current flowing) is

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 3 - Current Electricity>Exercise#1>Q 17

If on applying the potential of

20 V

on a conductor its conductance becomes

8 (Ω)^{- 1},

then the current flowing through it will be

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 3 - Current Electricity>Exercise#1>Q 18

Two wires of same dimension but resistivities

ρ_{1}

and

ρ_{2}

are connected in series. The equivalent resistivity of the combination is:

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 3 - Current Electricity>Exercise#1>Q 19

The dimensions of a block are

1 cm \times 1 cm \times 100 cm

. If the specific resistance of its material is

2 \times 10^{- 7}

ohm

\times

metre

, then the resistance between the opposite rectangular faces is

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 3 - Current Electricity>Exercise#1>Q 20

When a resistance wire is passed through a die the cross-section area decreases by

1 %,

the change in resistance of the wire is

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 3 - Current Electricity>Exercise#1>Q 21

When the resistance of copper wire is

0.1 Ω

and the radius is

1 mm

, then the length of the wire is (specific resistance of copper is

3.14 \times 10^{- 8} ohm m

),

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 3 - Current Electricity>Exercise#1>Q 22

A wire is stretched to

n

times its length. Then, the resistance will increase by,