Question

A 50 V battery is connected across a 10 resistor and a current of 4 .76 A flows. The internal resistance of the battery is:

• A. 0.5
• B. 0.1
• C. 0.2
• D. 0.3

Answer 1

The correct option is A 0.5

Given that-

$E=50V$ and $R=10\Omega$ and $i=4.76A$

$i=\frac{E}{R+r}$

$⟹4.76=\frac{50}{10+r}$

$⟹47.6+4.76r=50$

$⟹4.76r=2.4$

$⟹r=\frac{2.4}{4.76}$

$⟹r=0.5\Omega$

Answer-(A)