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Current Electricity question

2012 · Q174
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Current Electricity question

2012 · Q174

NEETPhysicsCurrent ElectricityMCQ+4 / −1
In the circuit shown the cells A and B have negligible resistances. For VA = 12 V, R1 = 500 Ω\OmegaΩ and R = 100 Ω\OmegaΩ the galvanometer (G) shows no deflection. The value of Vs is

AIPMT 2012 Prelims Physics - Current Electricity Question 89 English
  1. A
    4 V
  2. B
    2 V
  3. C
    12 V
  4. D
    6 V
View written solutionFree

Correct answer: B

Since the galvanometer shows no deflection so current will flow as shown in the figure.

AIPMT 2012 Prelims Physics - Current Electricity Question 89 English Explanation

Current,

I=VAR1+R=12V(500+100)Ω=12600AI = {{{V_A}} \over {{R_1} + R}} = {{12V} \over {\left( {500 + 100} \right)\Omega }} = {{12} \over {600}}AI=R1​+RVA​​=(500+100)Ω12V​=60012​A

VB=IR=(12600A)(100Ω)=2V{V_B} = IR = \left( {{{12} \over {600}}A} \right)\left( {100\Omega } \right) = 2VVB​=IR=(60012​A)(100Ω)=2V

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