Electrostatics Objectives Part 04
61 . The capacitance reactance of an AC circuit containing 35uf capacitance at a frequency of 60Hz will be 75 ohm.
62 . The power dissipated in a pure capacitor is zero.
63 . The back of two 0.5uf capacitors, 450v in series will have capacitance and breakdown voltage of 0.25uf, 900v
64 . The total capacitance of two condensers is 0.03uf when joined in series and 0.16uf when connected in parallel. The ratio of two capacitances will be 3
65 . The capacitance of a pair of parallel wires increases with radius and decreases with separation
66 . A condenser is connected for 0.35 second across a 220v supply the current being kept steady at 0.22A. The value of capacitance must be 250uf
67 . The total capacitance of two condensers is 0.03uf when joined in series and 0.16f when connected in parallel. The capacity of two condensers must be 0.04uf and 0.12uf
68 . If Q be the charge and C be the capacity of a condenser, then the energy stored in the capacitor is given by (Q*Q)/2C
69 . A condenser of 4uf each are connected in parallel. Their equivalent capacitance will be 16uf
70 . A capacitor is charged through a resistor of 1M ohm by dc source. If in one second the P.D. across the capacitor reaches 80% of its final value, the capacitance must have value closer to 0.62uf
71 . A capacitor of 40uf is charged to a potential difference of 500v, the charged acquired by it in coulomb is 0.02 C.
72 . If a current of one ampere passes through a lamp for 100 second, the number of coulombs of charge passing through the lamp in that time must be 100C.
73 . Two infinitely extended metal plates are both charged with equal surface density of the same polarity. The electric field in the gap between them is 0
74 . The electric flux inside a conducting sphere is 0
75 . In a parallel plate capacitor, a dielectric slab is introduced, the PD between slab will decreases
75 . A 0.1uf capacitor has its voltage increasing linearly at the rate of 100v each m second. The current flowing through the capacitor will be 0
76 . A 0.1uf capacitor has its charge increasing on one plate and decreasing on the other at the rate of 0.03C/s. The current flowing through the capacitor will be 10mA.
77. In a capacitor the electric charge is stored in dielectric as well as in metal plates
78 . A constant current of 5m A charges a 10uf capacitor for 1s. How much is the voltage across the capacitor? 500v
79 . Two plates each with an area of 2 m^2, are separated by 1cm with air as dielectric. The value of capacitance will be 1770pf
80 . A capacitor is charged to 100v and has 100uC of charges. The value of capacitance will be 10uf.