A) \[\frac{9}{10}\] ohm
B) \[\frac{10}{9}\] ohm
C) \[\frac{7}{12}\] ohm
D) \[\frac{12}{7}\] ohm
Correct Answer: B
Solution :
Given: \[E=2.2\,volt,\,\,R=5\,\,\Omega ,\,V=1.8\,\,volt,\,r=?\] Now current in the circuit \[i=\frac{E}{R+r}\] or \[\frac{V}{R}=\frac{E}{R+r}\] \[\frac{1.8}{5}=\frac{2.2}{5+r}\] or \[r=\frac{10}{9}\Omega \]You need to login to perform this action.
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