The conductor with higher temperature has

it does not affect the resistance

The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?

It is reduced by a factor of 4.

It is increased by a factor of 2.

It is increased by a factor of 4.

It is reduced by a factor of 2.

Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistivities of these two wires compare?

Both wires have the same resistivity.

The longer wire has 3 times the resistivity of the shorter wire.

The longer wire has 9 times times the resistivity of the shorter wire.

The longer wire has 27 times times the resistivity of the shorter wire.

A 20-m wire of 0.10 mm 2 cross-sectional area draws 0.5 A when connected across a 3.0-V potential difference. (a) What is the resistance of the wire? (b) What is the resistivity of the material from which the wire is made?

(a) 6.0 Ω (b) 3.0 × 10 -8 Ω • m

(a) 1.5 Ω (b) 6.0 × 10 -9 Ω • m

(a) 1.5 Ω (b) 3.0 × 10 -8 Ω • m

(a) 6.0 Ω (b) 6.0 × 10 -9 Ω • m

Xylene works in an electric company. She always recommends that longer extension cords should have a thicker diameter. Her recommendation made because resistance is __________.

directly with length and inversely with cross-sectional area

inversely with length and directly with cross-sectional area

directly with both length and cross-sectional area

inversely with both length and cross-sectional area

Resistance and Resistivity

Authored by Thao Phuong

Physics

11th Grade

Used 12+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which copper wire has the lowest resistance?

1 metre of 1 mm diameter wire

0.5 metre of 1 mm diameter wire

0.5 metre of 0.5 mm diameter wire

1 metere of 0.5 mm diameter wire

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to a resistor when the temperature is increased?

Increases

decreases

stay the same

vary randomly

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The length of a certain conductor of resistance 100 is doubled and its cross-sectional area is halved. Its new resistance is

100

200

400

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Factor which does not affect the resistance

Type of material

Length of material

Mass of the material

Area of the material

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Graph shows that _____________

Resistance is directly proportional to Area

Resistance is inversely proportional to Area

Resistance is a constant while Area changes.

Area is a constant while resistance changes.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

which has the highest current flowing through it?

All the same

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which one, top or bottom, offers more resistance?

top

bottom

neither

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Resistance and Resistivity

Which copper wire has the lowest resistance?

What happens to a resistor when the temperature is increased?

The length of a certain conductor of resistance 100 is doubled and its cross-sectional area is halved. Its new resistance is

Factor which does not affect the resistance

Graph shows that _____________

which has the highest current flowing through it?

Which one, top or bottom, offers more resistance?

The unit to measure the resistivity of a wire is

the current in the conductor

the resistance of the two conductor

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