Electrostatics II

Unit of CV² is equivalent to?

• Energy

• Work

• Power

• Both A & B

Two capacitors of capacities C₁ and C₂ are connected in parallel. If a charge Q is given to the assembly, it gets shared. Ratio of the charge on capacitor C₁ to the charge on capacitor C₂ is given by

• $\frac{C_1}{C_2}$

• $\frac{C_2}{C_1}$
  

• $\frac{C1^2}{C2^2}$
  

• $\frac{C2^2}{C1^2}$
  

Three capacitor of capacitance 3μF each are connected in series. Their equivalent capacitance is 

• 9μF 
  

• 6μF
  

• 3μF
  

• 1μF
  

1. The equivalent capacitance of three capacitors of capacitance C₁,C₂ and C₃ connect in parallel is 12 units and the product C₁C₂C₃=48. When the capacitors C₁ and C₂ are connected in parallel the equivalent capacitance is 6 units. The capacitance are

• 2,4,6

• 1,5,6

• 1.5, 2.5, 8

• 2,3,7

The capacitance of parallel plates capacitor is

• $\frac{dϵ_°}{A}$

• $\frac{ϵ_°}{Ad}$
  

• $\frac{Ad}{ϵ_°}$
  

• $\frac{Aϵ_°}{d}$
  

A parallel plate capacitor has capacitance of 50PF in air and 105 PF when immersed in oil. The dielectric constant of the oil is

•  50/105
  

• 1
  

• 2.1
  

•  $\infty$  
  

A 100 microfarad capacitor is to have an energy content of 50 J in order to operate a flesh lamp. The voltage required to charge the capacitor is

• 500V

• 1000V

• 1500V

• 2000V

Three capacitors. each of 1μF, are connected in parallel. To this combination, a fourth capacitor of 1μF is connected in series. The equivalent capacitance of the system is

• 3/4μF

• 4/3μF

• 2μF

• 4μF

In case of a parallel plate capacitor, ½  $∈_r∈_o$   $E^2$   give;

• Energy density

• Energy per unit volume

• Energy stored in a capacitor

• Both A & B  

As 1 ohm x 1 farad=1second. For  $M\Omega$  

x PF=

• Second

• ms  

•  $μs$  
  

•  $mμ$