Which of the following statements is true of the properties of a moving coil galvanometer?
THe coil has a small area
There are strong hair springs to gives a large control panlel
There is a strong permanent magnet to give high magnetic flux
it has a small number of turns of coil
Correct answer is C
The galvanometer possesses a rectangular coil mounted on a soft iron core rotating on a magnetic field induced by a permanent magnet.
2g
6g
10g
18g
Correct answer is A
From Faradays Law, mass deposited during electrolysis is given by
M = ItZ
=> Z = M/(It)
| = | __2 |
| 0.5x3x60x60 |
At what frequency would a capacitor of 2.5μF
used in radio circuit have a resistance of 250Ω
π/800 Hz
800/π Hz
200π Hz
2000π Hz
Correct answer is B
| Capacitive Reactance = | ___1 |
| 2π + C |
| => 250 = | ____1 |
| 2 x π x f x 2.5 x 106 |
| => F = | ___106 |
| 250 x 5.0 x π |
| = | 106 |
| 1250π |
The carbon-granules microphone works on the principle of change in
inductance
resistance
capacitance
voltage
Correct answer is B
No explanation has been provided for this answer.
A transistor is used in the amplification of signals because it
controls the flow of current
consumes a lot of power
allows doping
contains electron and hole carriers
Correct answer is A
No explanation has been provided for this answer.