6.3A
33.3A
37.2A
40.0A
Correct answer is A
XL = \(2\pi f L\)
= = 2 x 3.142 x 50 x 0.12
= 37.68\(\Omega\)
Z = \(\sqrt{R^2 + X_L^2} = \sqrt{4^2 + 37.68^2}\)
I = \(\frac{V}{z} = \frac{240}{37.89}\)
= 6.3A
Which of the following devices does not makes use of eddy current for its action? A/An
galvanometer
speedometer
induction furnace
speedometer
Correct answer is A
No explanation has been provided for this answer.
The capacitance of parallel plates capacitors varies
inversely as the square of the distance between the plates
directly as the square of the distance between the plates
inversely as the distance between the plates
directly as the distance between the plate
Correct answer is A
No explanation has been provided for this answer.
voltmeter
meterbridge
voltameter
potentiometer
Correct answer is D
No explanation has been provided for this answer.
720J
1200J
14400J
43200J
Correct answer is C
Q = \(\frac{V^2 t}{R}
= \frac{12^2 \times 10 \times 60}{6}\)
= 14400J