very simple

IIT JEE 2015 Coaching › Electricity and magnetism questions › very simple

consider two lamps with resistance R₁ and R₂ which are coneeted in parallel R₁>R₂

if the lamp of resistance R₁ now burns out, how will the illumination produced change?

will the illumination remain same
or decrease
or increase

Now if the resistors r connected in series and the lamp of resistance R₁ alone is plugged in and R₂ now burns out, how will the illumination produced change?

will the illumination remain same
or decrease
or increase

Assume dat the lighting circuit will be of negligible resistance

#Physics #Electricity and magnetism

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5 Answers

Lokesh Verma ·2009-01-15 04:34:04

Hint and solution!!!

Define: Illumination

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msp ·2009-01-15 05:14:45

for the second case after the resistor is burnt then no current will flow through the circuit and therefore the illumination will lgoes to zero...

sir correct me

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skygirl ·2009-01-15 05:34:26

in first case illumination will increase..

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Lokesh Verma ·2009-01-15 05:39:55

yes ur second part is correct :)

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Lokesh Verma ·2009-01-15 05:52:53

http://mysite.du.edu/~jcalvert/optics/lumens.htm

read for details..

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∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

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very simple

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