Find the current in the circuit.

• A

  $0.01 \mathrm{~A}$
• B

  $0.02 \mathrm{~A}$
• C

  $0.03 \mathrm{~A}$
• Correct answer
  D

  $0.04 \mathrm{~A}$

Solution

The given circuit diagram is
Equivalent resistance of given circuit $=(100 \Omega \| 100 \Omega)+100 \Omega+100 \Omega$ $=\frac{100 \times 100}{100+100}+200=50+200=250 \Omega$ Equivalent emf of circuit $=20-10=10 \mathrm{~V}$ Current in circuit, $I=\frac{E}{R_{\mathrm{eq}}}=\frac{10}{250}=0.04 \mathrm{~A}$

Hence, the correct answer is option: 'D'.