question_answer

Four identical resistors of 4 ohm each are joined in circuit as shown in the figure. The cell B has emf 2 volts and its internal resistance is negligible. The ammeter will read

A)   \[\frac{3}{8}\] ampere        

B)         2 ampere

C)  \[\frac{1}{2}\] ampere      

D)         \[\frac{1}{8}\] ampere

Correct Answer: A

Solution :

 Redraw the diagram with battery and the resistance in the common branch as the lower branch as shown below:                 \[{{R}_{eq}}=\frac{4}{3}+4=\frac{16}{3}\]                    \[I=\frac{V}{{{R}_{eq}}}=2\times \frac{3}{16}=\frac{3}{8}\]