Test Preparation on Physics-Electric Capacitor
1.
In order to increase the capacity of parallel plate condenser one should introduce between the plates, a sheet of:
2.
Three capacitors 4, 6, and 12 mF are connected in series to a 10 V source. The charge on the middle capacitor is :
10=q/4+q/6+q/12 \ q = 20mC
3.
Two 30 pF capacitors are joined in parallel. This combination is then joined in series with the series combination of two 30 pF capacitors. The effective capacitance will be :
4.
The equivalent capacitance between A and B in the circuit shown in figure, is :
5.
The equivalent capacity of the combination shown infigure is :
6.
A capacitor is charged by a battery to a potential V in aR-C circuit. The ratio of the energy supplied by thebattery to that stored in the capacitor, is :
7.
Two drops of a liquid are charged to the same potentialof 100 V. They are then merged into one large drop, thepotential of the large drop is :
8.
A parallel plate capacitor has capacitance of 10-12 F. Theseparation of the plates is doubled and wax is insertedbetween them which increases the capacitance to 2 x 10 F. The dielectric constant of wax is :
9.
A 60 mF capacitor has charge on each plate 3 x 10-6 Cthen the energy stored is :
10.
If q is the charge on the capacitor and £ is the magnitudeof the electric field between the plates, the force on eachplate of the capacitor is:
11.
A slab of copper of thickness b is inserted in between theplates of parallel plate capacitor as shown in figure. Theseparation between the plates is'd' if b = d/2, then the ratioof capacities of capacitors after and before inserting theslab will be : *
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