Question

The potential difference between the terminals of a cell is 40V when 10A are being drawn
and 46V when 4 A are being drawn. The emf of the cell and its internal resistance are
respectively,
(A) 50V, 10
(B) 45V, 1.20
(C) 55V, 80
(D) 6.0V, 1.2​

Answer 1

Answer:

Maybe

Explanation:

Given: V=12V, Resistance of A=4Ω, Resistance of B=6Ω, Internal battery resistance =2Ω

(i) Total Resistance =4+6+2=12Ω

I (current in circuit)=

Totalresistance

e.m.f.

=

12

12

=1amp

(ii) Voltage drop Ir=1×2=2volt

Terminal Voltage = emf - Voltage drop

=12−2=10 volts

(iii) Potential difference across 6Ω=IR

=1×6=6V

(iv) Energy spent =I

2

Rt

=(1)

2

×4×60=240J