21) If two capacitors of 2 micro F and 3 micro F are connected in series and then this group is connected across a capacitor of 4 micro F, the total capacity will be :

5.2 micro F

2.5 micro F

4.0 micro F

52 micro F

Answer is:

5.2 micro F

series

parallel

series-parallel

parallel-series

Answer is:

a capacitor across the supply

a capacitor across the switch contacts

arcing horns across the switch contacts

another small inductor across the switch contacts in reverse direction

Answer is:

material of the plate

area of the plate

voltage across the plate

polarity of the plates

Answer is:

0.1 ampere

10 ampere

22 ampere

40 ampere

Answer is: