here,
(Rc + Rd ) are in parallel with Rb, their equivalent resistance , R1 = Rb * ( Rc + Rd) /( Rb + Rc + Rd)
R1 = ( 5 + 5) * ( 10 ) /(10 + 5 + 5)
R1 = 5 ohm
R1 and Ra are in series , their equivalent resistance , Req = R1 + Ra = 10 ohm
the current through a , I = E/Req
I = 6 /10 A = 0.6 A
the potential difference across a , Va = I * Ra
Va = 3 V
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