Download App

Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectrostatic Potential and Capacitance3 Marks
✓

Answer

Capacitors  $C_2$, $C_3$ $\text{and}$ $C_4 $$\ \ \text{are in parallel}$
$\therefore C_{234}=C_2+C_3+C_4$
$\therefore C_{234}=6\mu F$
Capacitors $C_1$,$​​​​C_{234}$ $\text{and}$  $C_5$ are in series
$\frac{1}{C_{eq}}=\frac{1}{C_1}+\frac{1}{C_{234}}+\frac{1}{C_5}=\frac{1}{2}+\frac{1}{6}+\frac{1}{2}$
$=\frac{7}{6}\mu F$
$C_{equivalent}=\frac{6}{7}\mu F$
Charge drawn from the source
$Q=C_{eq}V,$
$=\frac{6}{7}\times7\mu C=6\mu C$
Energy stored $U=\frac{Q^2}{2C}$
$=\frac{6\times6\times10^{-12}\times7}{2\times6\times10^{-6}}\text{J}$
$=21\mu \text{J}$.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Electrostatic Potential and Capacitance→Electrostatic Potential and Capacitance — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Describe principle and construction of AC generator with figure and discuss its working.
→
A square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30º with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitude of torque experienced by the coil?
→
A steel rod is rigidly clamped at its two ends. The rod is under zero tension at 20°C. If the temperature rises to 100°C, what force will the rod exert on one of the clampa? Area of Cross section of the rod = 2.00mm2. Coefficient of linear expansion of steel  12.0 × 10-6 °C-1 and Young's modulus of steel = 2.00 × 1011N m-2.
→
A particle having a charge of 2.0 × 10-4C is placed directly below and at a separation of 10cm from the bob of a simple pendulum at rest. The mass of the bob is 100g. What charge should the bob be given so that the string becomes loose?
→
Can kinetic energy of a system be increased without applying any external force on the system?
→
Write any two distinguishing features between conductors, semiconductors and insulators on the basis of energy band diagrams.
→
  1. A rod of length l is moved horizontally with a uniform velocity ‘v’ in a direction perpendicular to its length through a region in which a uniform magnetic field is acting vertically downward. Derive the expression for the emf induced across the ends of the rod.
  2. How does one understand this motional emf by invoking the Lorentz force acting on the free charge carriers of the conductor? Explain.
→
A charge is distributed uniformly over a ring of radius ‘a’. Obtain an expression for the electric intensity E at a point on the axis of the ring. Hence show that for points at large distances from the ring, it behaves like a point charge.
→
State the underlying principle of a potentiometer. Write two factors by which current sensitivity of a potentiometer can be increased. Why is a potentiometer preferred over a voltmeter for measuring the emf of a cell?
→
  1. Define current sensitivity of a galvanometer. Write its expression.
  2. A galvanometer has resistance G and shows full scale deflection for current Ig.
  1. How can it be converted into an ammeter to measure current up to I0(I0 > Ig)?
  2. What is the effective resistance of this ammeter?
→