Parallel Circuits

What does R₁ equal in the given circuit?

A 90

B 180

C 200

D 1.8 k

ANS:B - 180

VIKAS, since I=50mA i.e 50*10^-3
so,IF IT GOES TO MUMERATOR IT WILL BECOME 10^3

i.e

R=9/50*10^-3= 9*10^3/50 =180

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