Answer:
The correct solution is "20 volt".
Explanation:
Given that:
Current,
I = 10 mA
or,
= 
Resistance,
R = 2 K ohm
or,
= 
Now,
The voltage will be:
⇒ 
By putting the values, we get


The answer is prototype, or the first choice. hope this helps (:
Answer:
The direction of the magnetic field around the coil reverses. The force on the cone now pulls it back in. Repeatedly alternating the current direction makes the cone vibrate in and out. The cone vibrations cause pressure variations in the air, which are sound waves.
Explanation:So as it goes back and forth it makes a sound from the vibration.
Answer:
Helps to remove Oxides formed during brazing.
Explanation:
Flux is needed to dissolve and remove oxides that may form during brazing. Prevent or inhibit the formation of oxide during the brazing process