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# Capacitance Questions And Answers Pdf

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Published: 22.03.2021  ## Capacitance MCQ Questions Answers Electrical Engineering

Is it a scalar or a vector quantity? Electric potential. It is a scalar quantity. Is the potential difference positive, negative or zero, if Q is a positive b negative? Let the distance of points A and B from charge Q be and respectively. Find the work done in moving a charge of 10 mC between two diagonally opposite points on the square.

As the two diagonally opposite points on the square are equidistant from the charge kept at the center, their potential is same, Therefore no work is done in moving the charge from one point to another. Mention one contrasting feature of electric potential of a dipole at a point as compared to that due to a single charge. Using principle of superposition of electric potential.

What is the potential at the center of the sphere? This outer shell has charge Q on it. Show that if these spheres are connected by a conducting fire, charge will always flow from the inner sphere to the outer sphere, irrespective of the magnitude of the two charges. Draw the equipotential surfaces due to an electric dipole. Two equipotential surfaces do not intersect each other.

Electric field is always perpendicular to the equipotential surfaces. How are constant electric field along Z- direction? The figure is shown below. In case of constant electric field along z- direction, the perpendicular distance between equipotential surfaces remains same. Sketch an equipotential surface due to electric field between the plates. For a particle of charge —q at rest between the plates, then i Weight mg acts, vertically downward ii Electric force qE acts vertically upward.

Give reasons. How much work is done in moving a test charge from point P 7,0,0 to Q —3,0,0? If two equipotential surface cross each other it means the electric fields cross each other which is not possible. Hence equipotential surface cannot cross each other. The potential is zero on the equatorial lie.

So no work is done in moving a charge from 7,0,0 to —3,0,0. Let three point charges , and have position vectors. Potential energy of the charges and.

At what point on the line joining the charges is the electric field intensity zero? Let electric field intensity be zero at any point P lying at a distance x m from charge Q between the two charges on the line joining them Figure. What is the potential energy of this charge configuration? Define an equipotential surface. It can be obtained by finding locus or set of points in the region of electrical field which are at the same potential.

Consider an electric dipole AB consists of two point charges separated by a distance 2a. It is placed in a uniform electric field E making an angle. E Therefore done in moving from stable to unstable equality i.

What is its effect on the capacitance of the capacitor? The voltage across the 6 capacitor is 2 V. Compute the total battery voltage. How will the a charge and b potential difference between the plates of the capacitors be affected after the slab are inserted?

For as it is disconnected, , Therefore,. The space between their plates is now filled with dielectrics as shown. If the two capacitors still have equal capacitance, obtain the relation between dielectric constant K, and.

How will its capacitance be affected if. Thus, new capacitance of each capacitor. The separation between the plates is now reduced by half and the space between them is filled with a medium of dielectric constant 5.

Calculate the value of capacitance of the capacitor in the second case. Given, capacitance of capacitor The battery used to charge it remains connected. A dielectric slab of thickness d and dielectric constant K is now placed between the plates.

What change, if any will take place in a Charge on plates? Justify your answer in each case. The capacitor are in series -. Obtain the value of the equivalent capacitance of this system and the value of Z. Let equivalent capacitance of the combination of capacitors in C. What is the new distance between the plates? Briefly explain the capacitance of a parallel plate capacitor increases, on introducing dielectric medium between the plates.

The ratio of the capacitance of a capacitor when a dielectric is placed between the plates to that when there is no insulating medium in between is called dielectric constant K. Where C is capacitance with dielectric, without dielectric. This causes electric field and hence potential between the plates to decrease.

It depends on the shape, size and geometry of capacitor. In series combination of capacitors, same charge lie on each capacitor , potential difference across the combination is equal to the algebraic sum of potential difference across each capacitor i. The capacitor is then disconnected from the source. If the distance between the plates is doubled state with reason how the following will changes? Electric field between the plates is given by. It does not depend on d Therefore E remains the same.

X has air between the plates while Y contains a dielectric medium of. Let C be the capacitance of x because. The battery is disconnected and a dielectric slab is inserted to completely fill the space between the plates. How will i Its capacitance, ii Electric field between the plates and iii Energy stored in the capacitor be affected? Justify your answer giving necessary mathematical expressions for each case. In which capacitor is more electrostatic energy stored? What will be their net capacitance if connected in parallel?

Find the ratio of energy stored in the two configurations if they are both connected to the same source. The battery is then disconnected and the charge capacitor is connected to another uncharged capacitor of pF. The charge will distribute but total charge would remain constant. Draw its labelled diagram. A stage reaches in this device when the potential at the outer sphere cannot be increased further by piling up more charge on it.

Explain Why? Principle 1. The phenomenon of electric discharge takes place in air or gases due to sharp points of the charged conductor with a splash of fire known as corona discharge. The potential of the inner sphere is always greater than the potential on the outer sphere. So,potential can not be increased further.

Login Register. Electric field between the plates is given by a When the capacitor is charged, disconnected. X has air between the plates while Y contains a dielectric medium of a Calculate capacitance of each capacitor if equivalent of the combination is. Leave a Reply Cancel reply. ## 3. Questions & Answers on Capacitance and Capacitors

On what factor does the capacitance of a parallel plate capacitor with dielectric depend? If on inserting a dielectric medium, its potential falls to 50 V, what is the dielectric constant of the medium? Derive an expression for the capacitance of a capacitor? With the help of a labelled diagram, explain the principle, construction and working of a vandegraff generator. Mention its applications? Vandegraff generator is a device which is capable of producing a high potential of the order of million volts.

Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks. A potential difference of volts is applied to the outer plates of the two capacitor system. In series combination, charge is same on capacitor. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education.

It will give the students a proper theoretical explanation of this chapter, enabling the students to solve the questions by themselves. The critical questions list; questions which are often asked in the exams; is enlisted, described and explained comprehensively by the experts. This chapter's important topics are more or less, the introduction to electrostatic potential and capacitance, Dielectrics and polarisation, the potential energy of a system charge, the relationship between field and potential, etc. It will enable the students to understand the chapter entirely and allow them to solve question answers independently. Electrostatic potential. Calculating the Capacitance. • Capacitors in Parallel and Series. • Energy Stored in an Electric Field. • Atomic Physics View of Dielectrics. • Capacitor with a.

## 3. Questions & Answers on Capacitance and Capacitors

Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks. A potential difference of volts is applied to the outer plates of the two capacitor system. In series combination, charge is same on capacitor. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education.

Electrostatics Potential And Capacitance. A XY-plane. C YZ-plane.

Does the capacitance of a device depend on the applied voltage? Does the capacitance of a device depend on the charge residing on it? Would you place the plates of a parallel-plate capacitor closer together or farther apart to increase their capacitance? Find the net capacitance of the capacitor? Here the two capacitors are in parallel Net capacitance.

#### Basic Science-physics Capacitor Question and Answers

The force between two charges is N. If the distance between the charges is doubled, the force will be a 60 N b 30 N c 40 N d 15 N Ans: b. The lines of force due to charged particles are a always straight b always curved c sometimes curved d none of the above Ans: b. The electric field at a point situated at a distance d from straight charged conductor is a proportional to d b inversely proportional to d c inversely proportional to d d none of the above Ans: b. The ability of charged bodies to exert force on 6ne another is attributed to the existence of a electrons b protons c neutrons d electric field Ans: d. What is the relation between current and voltage in a capacitor? If 2V is supplied to a 3F capacitor, calculate the chance stored in the capacitor. Is it a scalar or a vector quantity? Electric potential. It is a scalar quantity. Is the potential difference positive, negative or zero, if Q is a positive b negative? Let the distance of points A and B from charge Q be and respectively.

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constant for a parallel plate capacitor. d. all three choices. 8.) In a circuit, a capacitor has potential difference AV, charge Q, and capacitance C.

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