(c) Reading of voltmeter $= E_{eq} = \frac{E_{1}r_{2} + E_{2}r_{1}}{r_{1} + r_{2}} = \frac{18 \times 1 + 12 \times 2}{1 + 2} = 14V$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.