8. In the circuit diagram, potential difference betwema points \( A \) and \( B \) is \( 200 V \), the potential difference betweme points \( a \) and \( b \) when the switch \( S \) is open, is
(a) \( 100 V \)
(b) \( \frac{200}{3} V \)
(c) \( \frac{100}{3} V \)
(d) \( 50 V \)