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CBSE Class 12-science Answered

pls solve
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Asked by sulaikhasulu393 | 29 Apr, 2020, 05:17: PM
answered-by-expert Expert Answer
Consider Wheatstone Bridge PQRS as shown in figure, 
Ratio of heat generated in four arms PQ, QR, PS and SR 
 
 
R subscript 1 space equals space 10 space capital omega space R subscript 2 equals space 20 space capital omega space R subscript 3 space equals space 20 space capital omega space R subscript 4 equals space 40 space capital omega space B y space b a l a n c e space c o n d i t i o n space o f space w h e a t s t o n e space b r i d g e comma space R subscript 1 over R subscript 2 space equals space R subscript 3 over R subscript 4 space F r o m space g i v e n space d a t a comma space R subscript 1 over R subscript 2 space equals space 1 half R subscript 3 over R subscript 4 space equals space 1 half H e n c e comma space w h e a t s t o n e space b r i d g e space i s space b a l a n c e d. space I subscript 1 space a n d space I subscript 2 space a r e space t h e space c u r r e n t s space f l o w i n g space P Q space a n d space P S space r e s p e c t i v e l y. space T h u s comma space P. D. space a c r o s s space P space a n d space Q space w i l l space b e space e q u a l space P. D space a c r o s s space P space a n d space S space H e n c e comma space I subscript 1 space cross times R subscript 1 space equals space space I subscript 2 space cross times space R subscript 2 space rightwards double arrow space I subscript 1 space cross times 10 space equals space space space I subscript 2 space cross times space 20 space rightwards double arrow I subscript 1 space end subscript equals space 2 space I subscript 2 space T h u s comma space h e a t space g e n e r a t e d space i n space P Q space i s space g i v e n space b y space J o u l e apostrophe s space l a w space o f space h e a t i n g comma space H subscript 1 space equals space I subscript 1 superscript 2 space cross times space 10 space t equals space 40 space I subscript 2 superscript 2 space t space J space space.... space left parenthesis 1 right parenthesis space H e a t space i n space a r m space Q R space i s comma space H subscript 2 space equals space I subscript 1 superscript 2 space cross times space 20 space t equals space 80 space I subscript 2 superscript 2 space t space J.... space left parenthesis 2 right parenthesis space H e a t space i n space a r m space P S space i s comma space H subscript 3 space equals space I subscript 2 superscript 2 space cross times space 20 space t equals space 20 space I subscript 2 superscript 2 space t space J.... space left parenthesis 3 right parenthesis space H e a t space i n space a r m space S R space i s comma space H subscript 4 space equals space I subscript 2 superscript 2 space cross times 40 space t equals space 40 space I subscript 2 superscript 2 space t space J.... space left parenthesis 4 right parenthesis space T a k i n g space r a t i o space o f space left parenthesis 1 right parenthesis comma space left parenthesis 2 right parenthesis comma space left parenthesis 3 right parenthesis space a n d space left parenthesis 4 right parenthesis comma space w e space g e t comma space H subscript 1 space colon space H subscript 2 space colon space H subscript 3 space colon space H subscript 4 space equals space 40 space I subscript 2 superscript 2 space t space colon 80 space I subscript 2 superscript 2 space t space colon space 20 space I subscript 2 superscript 2 space t space colon 40 space I subscript 2 superscript 2 space t space equals space 2 colon 4 colon 1 colon 2 H e n c e comma space H subscript 1 space colon space H subscript 2 space colon space H subscript 3 space colon space H subscript 4 space equals space space 2 colon 4 colon 1 colon 2  
Option (3) is correct
Answered by Shiwani Sawant | 29 Apr, 2020, 06:53: PM

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CBSE 12-science - Physics
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Asked by guptakartikgupta2 | 16 Jul, 2022, 05:23: PM
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CBSE 12-science - Physics
in Current electricity, in section batteries and EMF, we studied that,in a battery a internal mechanism exerts forces on the charges of battery... sir can you please explain, how this force drives the charge in a battery and why these forces drive charges in that manner? please explain sir..
Asked by yashrajgharte24.12dgatl | 18 Aug, 2021, 09:29: PM
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CBSE 12-science - Physics
What is potential gradient along the wire Reading of voltmeter  
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Asked by diyasinha1701 | 31 Jul, 2021, 09:58: AM
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CBSE 12-science - Physics
pls solve
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Asked by sulaikhasulu393 | 29 Apr, 2020, 05:17: PM
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CBSE 12-science - Physics
A battery of end E and internal resistance r is used in a circuit with a variable external resistance R. Find the value of R for which the power consumed in R is maximum.
Asked by prakriti12oct | 28 Jul, 2019, 11:07: PM
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CBSE 12-science - Physics
By using the graph of terminal potential difference with external resistance how can we find internal resistance
Asked by rejimoljohn123 | 01 Jan, 2019, 09:08: PM
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CBSE 12-science - Physics
A 9 V battery is connected in series with a resistor .The terminal voltage is found to be 8 V. Current through the circuit is measured as 5 A. What is the internal resistance of the battery?
Asked by ayushmittal2424 | 09 Dec, 2018, 09:45: PM
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CBSE 12-science - Physics
Establish the expression for current flowing through an external resistance R connected to a cell of e.m.f. E and internal resistance r.
Asked by sd2021667 | 02 Dec, 2018, 09:09: PM
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CBSE 12-science - Physics
Draw a circuit diagram for the comparying of emf of two primary cell using a potentiometer
Asked by rohitbansal39295 | 15 Nov, 2018, 09:00: PM
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CBSE 12-science - Physics
two cells of voltage 10 v and 2 v and internal resistances of 10ohm and 5 ohm respectively, are connected in parallel with positive end of 10v battery connected to negative pole of 2v battery.find the effective voltage and effective internal resistance of the combination.
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Asked by my3shyll | 24 Sep, 2018, 07:33: PM
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