Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Test yourself>Q 17

MEDIUM

Diploma

IMPORTANT

Earn 100

The graph shows the current as a function of voltage across the same piece of metal wire which is kept at two different temperature.

Discuss whether the wire obey Ohm's law.

Important Questions on Electricity and Magnetism

HARD

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Test yourself>Q 17

The graph shows the current as a function of the voltage across the same piece of metal wire which is kept at two different temperatures.

Suggest which of the two lines on the graph corresponds to the higher temperature.

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MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Test yourself>Q 18

The current in a device obeying Ohm's law is

1.5 A

when connected to a source of potential difference of

6.0 V

.What will be the potential difference across the same device be when a current of

3.5 A

flows in it?

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Test yourself>Q 19

A resister obeying Ohm's law is measured to have a resistance of

12 Ω

when a current of

3.0 A

flows in it. Determine the resistance when the current is

4.0 A

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Test yourself>Q 20

The heating element of an electric kettle has a current of

15 A

when connected to a source of potential difference

220 V

. Calculate the resistance of the heating element.

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Test yourself>Q 21

The diagram shows two resistors with a current of 2.0A flowing in the wire. Calculate the potential difference across each resistor

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EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Test yourself>Q 21

The diagram shows two resistors with a current of 2.0A flowing in the wire.

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State the potential between B and C.

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Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Test yourself>Q 22

The filament of a lamp rated $120 W$ as $220 V$ At has a resistivity $2.0 \times 10^{- 6} Ω m$ .

What is the resistance of the lamp when it is connected to a source of $220 V$ (in $Ω$ )?

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Test yourself>Q 22

The filament of a lamp rated

120 W

as

220 V

At has resistivity

2.0 \times 10^{- 6} Ω m

. The radius of the filament is

0.030 m m

And resistance is

403 Ω

. Determine the length.(in m)