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======= ####91. Two identical batteries each of e.m.f $2 V$ and internal resistance $1 Ω$ are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across $R$ using these batteries is

c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $3.2 W$

(b) $2.0 W$

(d) $\frac{8}{9} W$

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Answer:

Correct Answer: 91. (b)

Solution:

(b) For maximum current, the two batteries should be connected in series. The current will be maximum when external resistance is equal to the total internal resistance of cells i.e. $2 Ω$ . Hence power devloped across the resistacne $R$ will be

$I^{2} R = (\frac{2 E}{R + 2 r})^{2} R = (\frac{2 \times 2}{2 + 2}) \times 2 = 2 W$

Current Electricity - Result Question 86

91. Two identical batteries each of e.m.f $2 V$ and internal resistance $1 Ω$ are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across $R$ using these batteries is

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Answer:

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Current Electricity - Result Question 86

91. Two identical batteries each of e.m.f 2V and internal resistance 1Ω are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across R using these batteries is

«««< HEAD

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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91. Two identical batteries each of e.m.f $2 V$ and internal resistance $1 Ω$ are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across $R$ using these batteries is