### 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.**