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12th West Bengal Board

IMPORTANT

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Three resistances of equal value are arranged in the different combination as shown below. Fig. $6.22$ . Arrange them in increasing order of power dissipation.

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Important Questions on Thermal Effect and Chemical Effect of Current

MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 34

A torch bulb rated at

4.5 W, 1.5 V

is connected as shown in Fig.

6.23

. The emf of the cell needed to make the bulb glow at full intensity is

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MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 35

A wire of length

L

and

3

Identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by

Δ T

In time

t

. Number

N

Of similar cells is new connected in series with a wire of the same material and cross-section but of length

2 L

. The temperature of the wire is raised by the same amount

Δ T

In the same time

t

. The value of

N

Is-

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 36

100 W

bulb

B_{1}

and two

60 W

bulb

B_{2}

and

B_{3}

are connected to a

250 V

source as shown in the figure, Fig.

6.24

. Now

W_{1}, W_{2}

and

W_{3}

are the output power of the bulb

B_{1}, B_{2}

and

B_{3}

respectively. Then

Question Image

MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 37

Fig.

6.25

Shows three resistor configuration

R_{1}, R_{2}

and

R_{3}

Connected to a

3 V

Battery. If the power dissipated by the configuration

R_{1}, R_{2}

and

R_{3}

P_{1}, P_{2}

and

P_{3}

Respectively, then

Question Image

EASY

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 38

In candescent bulbs are designed by keeping in mind that the resistance of third filament increases with the increases in temperature. If at room temperature,

100 W, 60 W

and

40 W

Bulbs have filament resistance

R_{100}, R_{60}

and

R_{40}

Respectively, the relation between their resistances is

MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 39

When two identical batteries of internal resistance $1 Ω$ Each are connected in series across a resistance $R$ , the rate of heat produced in is $J_{1}$ . When the same batteries are connected in parallel across $R$ , the rate is $J_{2}$ . If $J = 2.25 J_{2}$ Then the value of $R$ in $Ω$ is

MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 40

B_{1}, B_{2}

and

B_{3}

Are the three identical bulb connected to a battery of steady emf with key

k

Closed, Fig.

6.26

. What happens to the brightness of the bulbs

B_{1}

and

B_{2}

, when the key is opened ?

Question Image

MEDIUM

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 41

t_{1}

and

t_{2}

are the times taken by two different coils from producing same heat with same supply, then the time taken by them to produce the same heat when connected in parallel will be

Three resistances of equal value are arranged in the different combination as shown below. Fig. 6.22. Arrange them in increasing order of power dissipation.

Important Questions on Thermal Effect and Chemical Effect of Current

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Three resistances of equal value are arranged in the different combination as shown below. Fig. $6.22$ . Arrange them in increasing order of power dissipation.