Discussion Forum



1)

A potential difference across the terminals of a battery is 50V when 11A current is drawn and 60V when 1A current is drawn. The emf and the internal resistance of the battery are 


A) $6 V , 2\Omega$

B) $63 V , 1\Omega$

C) $61V , 1\Omega$

D) $64 V , 2\Omega$

Answer:

Option C

Explanation:

For a closed-circuit cell supplies a constant current in the circuit 

 1102021655_j7.PNG

For cell   E=V+Ir

For V=50V

E=50+11r

similarly, for V=60V

  E=60+r

From Eqs.(i) and (ii), we get

E=61V