Question

Quality answer needed✌✌
spammers stay away
A d.c. main supply of e.m.f 220 v is connected across a storage battery of e.m.f 200 v through a resistance of 1ohm .the battery terminals are connected to an external resistance R. The minimum value of R so that a current passes through the battery to charge it is ??
a) 7 ohm
b) 9 ohm
c) 11 ohm
d) zero
answer with proper explaination.....

​

Answer 1

Hey dear,

◆ Answer-

R = 11 ohm

◆ Explaination-

# Given-

r = 1 ohm

E = 200 V

V = 220 V

# Solution-

Let R be minimum value of resistance required.

Resistance of battery is calculated by-

r = R (V-E) / V

R = rV / (V-E)

R = 1 × 220 / (220-200)

R = 220/20

R = 11 ohm

Therefore, minimum value of resistance required so that current passes through battery to charge it is 11 ohm.

Hope it helps...

Answer 2

Answer:

The correct answer is option c...