Question

A set of n equal resistors, of value R each. are connected in series to a battery of emf E and internal resistance R. The current drawn is l Now the n resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 l. The value of n is 

(a) 10 

(b) 11 

(c) 20 

(d) 9

Answer 1

Correct option  (a) 10 

Explanation:

Current drawn from a resistors are connected in series is

Current drawn from same battery when n resistors are connected in parallel is

After solving the equation, n= 10