Physics

Current Electricity

Voltmeter

In the circuit, a voltmeter reads 30 {~V} when it is connected

Question

Medium

Solving time: 3 mins

In the circuit, a voltmeter reads $30 V$ when it is connected across $400Ω$ resistance. Calculate what the same voltmeter will read when it is connected across the $300Ω$ resistance?

Name: Video answer for In the circuit, a voltmeter reads 30 V when it is connected across 400Ω resistance. Calculate what the same voltmeter will read when it is connected across the 300Ω resistance?
Uploaded: 2022-08-17T09:14:40.000Z
Duration: 12 min
Description: In the circuit, a voltmeter reads 30 V when it is connected across 400Ω resistance. Calculate what the same voltmeter will read when it is connected across the 300Ω resistance?

Views: 5,832 students

Updated on: Aug 17, 2022

Book:

Electricity and Magnetism (DC Pandey)

Text solutionVerified

Voltmeter reads

30 V

, half of

60 V

. Hence, resistance of

400Ω

and voltmeter is also equal to

300Ω

∴ 300 = (\frac{400 \times R}{400 + R})

where,

R =

resistance of voltmeter.
Solving the above equation, we get

R = 1200Ω

In the new situation,

R_{n e t} = 400 + \frac{( 300 ) ( 1200 )}{300 + 1200} = 640Ω

∴ i = \frac{60}{640} = 0.09375 A

Now voltage drop across
Voltmeter

= 60 -

potential drop across

400Ω

resistor

= 60 - (400) i

= 60 - (400) (0.09375)

= 22.5 V

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Mila Discussed

In the circuit, a voltmeter reads

30 V

when it is connected across

400Ω

resistance. Calculate what the same voltmeter will read when it is connected across the

300Ω

resistance?

12 mins ago

Discuss this question LIVE

12 mins ago

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Question Text	In the circuit, a voltmeter reads $30 V$ when it is connected across $400Ω$ resistance. Calculate what the same voltmeter will read when it is connected across the $300Ω$ resistance?
Updated On	Aug 17, 2022
Topic	Current Electricity
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 2
Upvotes	308
Avg. Video Duration	9 min

In the circuit, a voltmeter reads $30 V$ when it is connected across $400Ω$ resistance. Calculate what the same voltmeter will read when it is connected across the $300Ω$ resistance?

Text solutionVerified

Video solutions (2)

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In the circuit, a voltmeter reads $30 V$ when it is connected across $400Ω$ resistance. Calculate what the same voltmeter will read when it is connected across the $300Ω$ resistance?