Question

If the ammeter in the given circuit reads 2 A, the value of resistance R is

• A. $1\Omega$
• B. $2\Omega$
• C. $3\Omega$
• D. $4\Omega$

Answer 1

The correct option is A $1\Omega$

The equivalent resistance of the circuit can be calculated as:
$R_{eq}=\frac{3\times 6}{3+6}+R(2+R)\Omega$
$I=\frac{V}{R_{eq}}=\frac{6}{2+R}$
$\Rightarrow 2=\frac{6}{2+R}[SinceI=2A]$
$\Rightarrow R=1\Omega$
Hence, the correct answer is option (a).