In the circuit shown below, the internal resistance of the cell negligible. The distance of the slider from the left-hand end of the slide wire is l. The graph shows the variation with l of the current 1 in the cell. (ammeter resistance → 0)
7. The balance point is at length 1 that is equal to
(A) 0 cm
(B) 20 cm
(C) 30 cm
(D) 40 cm
8. E.M.F. of the cell is:
(A) 0.98 V
(B) 1.20 V
(C) 1.86 V
(D) 2.00 V
9. Value of the resistance R is:
(A) 30 Ω
(B) 35 Ω
(C) 40 Ω
(D) 45 Ω
