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Q.
If the ammeter in the given circuit reads $ 2 \,A $ , the resistance $ R $ is
AMUAMU 2019
Solution:
Equivalent resistance of $3\Omega$ and $6\Omega$
$R' =\frac{3\times6}{3+6}$ (in parallel)
$R' =\frac{3 \times 6}{3+6}$ (in parallel)
$=\frac{18}{9}=2\Omega$
Total resistance $=2+R$ (in series)
$i=\frac{V}{R}; 2=\frac{6}{2+R}$
$2+R=3$
$\Rightarrow R=1\, \Omega$
