Direction (Q. No. 19 and 20): Read the passage carefully and answer following questions. A simple a.c. generator produces an alternating emf as shown in figure (i).

Figure (1) If the speed of the coil is changed then the graph of the new output is shown in figure (ii).

In which graph the frequency of the alternating emf is higher?

Options

A. In graph (i)
B. In graph (ii)
C. In both the graphs the frequency is same.
D. Data is insufficient.

Explanation

In graph (i) time period, `T_1 = 2 s, `
so frequency `upsilon = (1)/(T_1) = (1)/(2) HZ`
`rArr upsilon_1 = 0.5 Hz`
In graph (ii) ,time period, `T_2 = 4` s
Frequency, `upsilon_1 = (1)/(T_2) = (1)/(4) Hz = 0.25 Hz`
`therefore upsilon_1 gt upsilon_2`