MEDIUM

JEE Advanced

IMPORTANT

Earn 100

Two circular rings of identical radii and resistance of $36 Ω$ each are placed in such a way that they cross each other’s centre $C_{1}$ and $C_{2}$ as shown in the figure. Conducting joints are made at intersection points $A$ and $B$ of the rings. An ideal cell of emf $20 V$ is connected across $A$ and $B$ . Find the power delivered by the cell (in $10^{2} W$ ).

Important Questions on Heating Effects of Current

HARD

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Exercise>Q 5

10 m

long nichrome wire having

80 Ω

resistance has a current carrying capacity of

5 A

. This wire can be cut into equal parts and equal parts can be connected in series or parallel. What is the maximum power which can be obtained as heat by the wire from a

200 V

mains supply? (in

k W

)

EASY

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Exercise>Q 6

An electric current of

2.0 A

passes through a wire of resistance

25 Ω

. How much heat will be developed in

1 \min

? (in

\times 10^{3} J

)

MEDIUM

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Exercise>Q 7

Two identical batteries each of emf

E = 2 V

and internal resistance

r = 1 Ω

are available to produce heat in an external resistance by passing a current through it. What is the maximum power (in

W

) that can be developed across an external resistance

R

using these batteries?

EASY

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Exercise>Q 8

Each of the three resistors in the figure has a resistance of $2.4 Ω$ and can dissipate a maximum of $36 W$ without becoming excessively heated. What is the maximum power (in $W$ ) the circuit can dissipate?
Question Image

MEDIUM

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Exercise>Q 9

A battery has an open circuit potential difference of

6 V

between its terminals. When a load resistance of

60 Ω

is connected across the battery, the total power dissipated by the load resistance is

0.4 W

. When a load resistance

(R)

is connected with such a battery the power dissipated in the circuit is maximum. Calculate the power dissipated in

R

Watt (W)

MEDIUM

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Exercise>Q 10

500 W

heater is designed to operate at

200 V

potential difference. If it is connected across

160 V

line, find the heat (in

k J

) it will produce in

20 \min

MEDIUM

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Exercise>Q 11

A storage battery with emf

E = 2.6 V

loaded with and external resistance produces a current

I = 1.0 A

. In this case, the potential difference between the terminals of the storage battery equals

V = 2.0 V

. Find the ratio of the thermal power generated in the battery to the power supplied by the battery.

MEDIUM

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Exercise>Q 12

A battery of emf

ε

fitted with a resistor

R

in series supplies current to the resistors between

A

and

B

in the upper part of the circuit. If the power dissipated in the network between

A

and

B

as shown by rounded dotted line does not get affected by closing the key

K

, find the value of

R

(in

Ω

) if

R^{'} = 20 \sqrt{2}

Important Questions on Heating Effects of Current

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