1Re:
1. A- Amplitude modeulation can be obtained using a transistor
R- There is need of positive feedback to obtain AM.
2. A- (For a prism of refracting angle 60º and refractive index, μ = underroot2 , the Minimum deviation is 30º
R- (Atminimum deviation, r1 = r2 =A/2= 30º
3. A- Potentiometer measures emf.)
R- (Voltmeter measures potential difference
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4 Answers
393) A False R true...potentiometers compare emfs of two cells, they do not measure emf. Emf cannot be measured that way, as it is the terminal pd of a cell in which no current is drawn. Some amount of current has to be drawn to obtain a reading, even on a voltmeter.