four cells each of 1.5V and internal resistance 0.5 ohm are connected in series but one cell is connected with opposite polarity. The net voltage and internal resistance is
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Answer:
The cells are connected in series hence, the equivalent of internal resistances of cells is
r=
4
1
+
4
1
+
4
1
+
4
1
r=
4
4
=1Ω
One of the cells is incorrectly connected because its terminals are reversed.
The cell has equal emf hence in series total emf is
E=1.5−1.5+1.5+1.5=3V
Let, the external resistance is, R=1Ω
The current in circuit is
I=
R+r
E
I=
1+1
3
I=
2
3
=1.5A
Explanation:
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