Answer :
(a) Here both resistance i.e. R1 = 500 ohm, R2 = 1000 ohm are connected in series
So equivalent resistance R = R1 + R2 = 500 + 1000 = 1500ohm.
(b) Here both resistance i.e. R1=2ohm, R2=2ohm are connected in parallel
So equivalent resistance
1/R=1/R1+1/R2
1/R=1/2+1/2
R=1ohm
(c) Here resistance R1=4ohm and R2=4ohm are in parallel and R3=3ohm are in series
According to the given figure,
1/R=1/R1+1/R2
1/R=1/4+1/4
R=2ohm
Total resistance of the given circuit =R+R3
=2+3=5ohm
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