If the switch at point P is opened (shown in the figure), choose the correct option.

Options

A. The current in `R_1` would not change.
B. The potential difference between point X and the ground would increase.
C. The current provided by the battery would decrease.
D. The emf produced by the battery (assumed to have no internal resistance) would change.

Answer

B, C

Explanation

b., c.
Let a current I flows in circuit, then
`V_(G) + E - IR_1 = V_(X) - V_(G) = E-IR_1`
It switch is opened, then equivalent resistance increases so I
decreases. Hence `V_(X) = V_(G)` increases.