Physics Classes

Category: 12th Assignments

  • IMPORTANT QUESTIONS OF CURRENT ELECTRICITY

    IMPORTANT QUESTIONS OF CURRENT ELECTRICITY

    CURRENT ELECTRICITYCURRENT ELECTRICITY

    IMPORTANT QUESTION OF CURRENT ELECTRICITY

    THIS ASSIGNMENT PROVIDE  ALL IMPORTANT QUESTIONS OF CURRENT ELECTRICITY CHAPTER .

    This question paper is designed for quick revision for the students of class 12th appearing in the class test or board examination , if students have to practice the question of current electricity in broad level click on  complete assignment of electric current 

    1 (i)State the working principle of a potentiometer. With the help of the circuit diagram, explain how a potentiometer is used to compare the emf’s of two primary cells. Obtain the required expression used for comparing the emf’s.

    (ii) write two possible causes for one sided deflection in a potentiometer experiment.

    (iii)Which material is used for potentiometer wire and why?

    (iv)how can the sensitivity of a potentiometer be increased?

    2. Answer the following

    (i) Why are the connections between the resistor in a meter bridge made of thick copper strips?

    (ii)Why is it generally preferred to obtain the balance point in the middle of the meter bridge wire?

    (iii)which material is used for the meter bridge wire and why?

    3. (i)State with the help of a circuit diagram, the working principle of a meter bridge. Obtain the expression used for determining the unknown resistance.

    (ii) what happens if the galvanometer and cell are interchanged at the balance point of the bridge?

    (iii) why is it considered important to obtain the balance point near the mid- point of the wire?

    4. (a) A cell of emf E and internal resistance r is connected across a variable resistor R. Plot a graph showing the variation of terminal potential V with resistance R.

    (b) Plot a graph showing the variation of terminal potential difference across a cell of emf E and internal resistance r with current drawn from it. Using this graph how does one determine the emf of the cell?

    5. Two conducting wires X and Y of same diameter but different materials are joined in series across a battery. If the number of density of electrons in X is twice than that in Y, then find the ratio of drift velocity of electrons in the two wires.

     If students wants to quick revision in short time practice these question-  IMPORTANT QUESTIONS OF ELECTRIC CURRENT-

     

  • IMPORTANT QUESTIONS OF ELECTROSTATIC POTENTIAL AND CAPACITANCE

    IMPORTANT QUESTIONS OF ELECTROSTATIC POTENTIAL AND CAPACITANCE

    ELECTROSTATIC POTENTIAL AND CAPACITANCE

    ELECTROSTATIC POTENTIAL AND CAPACITANCE
    ELECTROSTATIC POTENTIAL AND CAPACITANCE

    THIS QUESTION PAPER CONTAINS THE IMPORTANT QUESTIONS OF ELECTROSTATIC POTENTIAL AND CAPACITANCE IT IS IMPORTANT FOR THE BOARD EXAMINATION FOR CLASS 12TH

    1. What do you mean by the term equipotential surface ? Draw the equipotential surface for (i) a point charge, (ii) an electric dipole , (iii) two positive charges of equal magnitude separated by some distance (iv) two uniformly large parallel thin plates having charge density +σ and -σ separated d distance apart. Can two equipotential surface intersect each other ? give reason. Why there is no work done in moving a charge fro one point to other on an equipotential surface? TO DOWNLOAD COMPLETE QUESTIONS PAPER CLICK HERE –ELECTROSTATIC POTENTIAL AND CAPACITANCE
  • Very important questions of ELECTRIC CHARGES AND FIELDS

    Very important questions of ELECTRIC CHARGES AND FIELDS

    ELECTRIC CHARGES AND FIELDS
    ELECTRIC CHARGES AND FIELDS

    ELECTRIC CHARGES AND FIELDS

    This assignment contains very important questions of ELECTRIC CHARGES AND FIELDS

    1. Explain the following terms –(a) Quantisation of charge . (b) Additivity of charge and (c) conservation of charge.
    2. What is electric field lines ? Draw the field lines for (a) A positive charge (b) A negative charge (c) An electric dipole (d) Two positive charge having equal magnitude separated by some distance, (e)  ) Two positive charge having different magnitude separated  by some distance, and (f) A plane positively charged sheet (g) A positive point charge  (+q) is kept in the vicinity of an uncharged conduction plate. Sketch the electric field lines originated from the point on to the surface of the plate. Also explain why ( I ) Field lines never intersect each other? (ii) Why field lines always comes out normally to the surface ?
    3. What do you mean by the term electric dipole and dipole moment? Is it scaler or vector quantity? Find the electric at a point the (i) axial  and  (ii) equatorial point , also find the relation between them . Also deduce an expression for the torque acting on a dipole and energy stored in the dipole when it is placed in the uniform electric field E .What will happen to the dipole when it is placed in non – uniform electric field?
    4. State and prove Gauss theorem . Using Gauss’s theorem find the magnetic field at a point due to (i) straight charged wire , (ii) plane charged sheet , show that it is independent of distance of the point from the sheet , and (iii) charged spherical shell also plot the graph between electric field and separation of point from the centre of the shell. Using Gauss’s law also derive  an expression for the electric field between two uniformly charged  parallel sheets of charge density σ and -σ respectively
    5. (i)Define electric flux  , write its SI unit . (ii)The electric field components due to a charge inside the cube of side 0.1m are shown below      Ex=αx   ,  where α =500N/C-m EY=0,EZ=0Calculate (a) The flux through the cube (b)the charge inside the cube CLICK HERE TO DOWNLOAD-Very important questions for ELECTRIC CHARGES AND FIELD 

     

  • OBJECTIVE QUESTIONS OF ELECTROSTATICS

    OBJECTIVE QUESTIONS OF ELECTROSTATICS

    ELECTROSTATICS

    OBJECTIVE TYPE QUESTIONS OF ELECTROSTATICS FOR THE STUDENTS PREPARING FOR JEE/ NEET/AIIMS.

    OBJECTIVE TYPE QUESTIONS OF ELECTROSTATICS questions will help the students to practice the entire chapter of ELECTROSTATICS …..Having solved these question students will be able to solve all questions in all competitive examinations based on this chapter . Section A is for NEET and XII(board), section B is for JEE students.

     

    ELECTROSTATICS

     

    TO DOWNLOAD ENTIRE QUESTION PAPER

     

    OBJECTIVE TYPE QUESTIONS -1-electrostatics

    Here is another set of important objective questions for class 12th which contain all important questions of electric field and potential only, it will help the students to practice this chapter well , for board examination  point of view .

    To dawnload important objective questions for class 12th-click here -Electric Field and Potential.objective 2

     

  • assignment electric current class 12

    assignment electric current class 12

    this assignment deals with chapter electric current. this assignment will help the students to practice well and score good marks in board examinations.

    Current electricity Assignments Download
  • Electrostate Assignment-1 for the class 12

    Electrostate Assignment-1 for the class 12

    These questions are based on the 12th Board examination. This first set of questions cover the chapters of Electrostatic in Physics where we deal with charge in rest and what properties it shows. Check the questions below of electrostate Assignment-1 for the class 12 .

    Short answer type Questions

    Q1. Can a charged body attract an uncharged body?

    Q2. A small test charge is released at rest at a point in an electrostatic field. Will it travel along the field line passing through that point?

    Q3. In an electric field an electron is kept freely. If the electron is replaced by proton, what will be the relationship between the forces experienced by them?

    Q4. A metallic sphere is placed in uniform electric field as shown in the figure. Which path is followed by electric field lines and why?

    Download the Electrostate Full Question Here

    Q5. find the value of electric field that would exactly balance the weight of electron.

    Q6. if the Coulomb’s law involved 1/r3 dependence (instead of 1/r3), where r is distance between two point changes would Gauss’s law still be true?

    Q7. A glass rod is rubbed with silk. Will its mass increase or decrease ?

    Q8 . An electrostatic field line cannot be discontinuous, why?

    Q9. Which orientation of an electric dipole in a uniform electric field would correspond to stable equilibrium ?

    Q10. The distance of the point on equatorial plane of a small electric dipole is halved. By what factor will the electric field due to dipole at the point changes?

    Q11. When two electrically charged particles having charges of different magnitude are placed at a distance d from each other, they experience a force of attraction F. these two particles are put in contact and again placed at the same distance from each other. What is the nature of new forces between them ?

    Guidence : This is the researched Electrostate Assignment of Physics Classes by Nayan Jha. Please read the questions carefully before attempting.

    Q12. What is the line of symmetry of a dipole field?

    Check for 12th Class Notes -Click Here


    Q13. Repulsion is the sure test of electric charge. Explain

    Q14. An electric dipole moment P is placed in a uniform electrostatic field E. for what angle between P and E will the potential energy of the electric dipole be half of its maximum value?

    Q15. Figure shows three point charges +2q , -q and +3q. two charges +2q and –q are enclosed within a surface S. what is the electric fix due to this configuration through the surface S?


    Download the 12th class Test paper of Electrostate

    Class 12 test 1 electrostateDownload