Q.
A battery is charged by a supply of 100 V as shown in figure. The charging current is 1.0A. the value of R is
A) 88$\ \Omega$
B) 68$\ \Omega$
C) 44$\ \Omega$
D) None of these
Explanation
(a) Effective emf in circuit $= 100 - 12 = 88V$
Current in circuit
$i = \frac{effective\ emf}{resistance} = \frac{88}{R}$
Or $R = \frac{88}{i} = \frac{88}{1} = 88\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.