For critical frequency of 10 MHz, the maximum usable frequency for angle of incidence of 60� will be
(a) 10MHz
(b) 20 MHz
(c) 11.7 MHz
(d) 45 MHz
(b) 20 MHz
(c) 11.7 MHz
(d) 45 MHz
In the circuit shown, the ammeter reads 1 ampere and voltmeter 10 volts. The internal resistance of the ammeter is 1 ohm and that of voltmeter is 50 ohms. The value of R is _______.
(a) 111 .2 ohms (b) 120 ohms (c) 100 ohms (d) 112 ohms Ans: D
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