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CBSE Class 12-science Answered

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Asked by Varsneya Srinivas | 21 Feb, 2018, 08:59: PM
answered-by-expert Expert Answer
Let us assume the first statement (A) is true and we take potential at D = 40 V
 
current in the segment AD = (70-40)/10 = 3A ; current in the segment DB = 40/20 = 2A; current in the segment DC = (40-30)/30 = 1 A.
Hence second staement (B) is true.
 
power dissipated by 10Ω resistor in the segment AD = 3×3×10 = 90 W ;
power dissipated by 20Ω resistor in the segment DB = 2×2×20 = 80 W ;
power dissipated by 30Ω resistor in the segment AD = 1×1×30 = 30 W ;
 
total power dissipation = 90+80+30 = 200 W ; hence third statement (C) is true;
 
Hence the correct choice to be selected as (D) all the above.

Answered by Thiyagarajan K | 22 Feb, 2018, 12:14: PM

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