Question

5. The internal resistance of a 4 V cell which
gives a current of 0.2 A through a
resistance of 10 S2 is
(a) 0.2 ohm
(b) 10 ohm
(c) 0.8 ohm
(d) 1.0 ohm​

Answer 1

Answer:(b)10 ohm

I=E/R+r

Explanation:

0.2=4/10+r

0.2(10+r)=4

2+0.2 r=4

0.2 r=2

r=10 ohm

Answer 2

Answer:

Explanation:

use formula

r=(E/V-1)R

r=internal resistance

E=emf=V+ir

V=terminal potential

R=external resistance

put the value then get answer