Given:
Voltage at point $a$, $V_a = 200 V$
Resistance $R_1 = 4 \Omega$
Resistance $R_2 = 6 \Omega$
Resistance $R_3 = 9 \Omega$
Point $G$ is grounded, so its potential $V_G = 0 V$.
The circuit shows that $R_1$ and $R_2$ are connected in parallel, and this parallel
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