Page 1 CBSE TEST PAPER-01 CLASS - XII PHYSICS (Unit â€“ Electrostatics) 1. Show does the force between two point charges change if the dielectric constant of the medium in which they are kept increase? [3] 2. A charged rod P attracts rod R where as P repels another charged rod Q. What type of force is developed between Q and R? [1] 3. A free proton and a free electron are placed in a uniform field. Which of the two experience greater force and greater acceleration? [2] 4. No two electric lines of force can intersect each other? Why? [2] 5. A particle of mass m and charge q is released form rest in a uniform electric field of intensity E. calculate the kinetic energy it attains after moving a distance s between the plates? [3] 6. Two point charges +q and +9q are separated by a distance of 10 a. Find the point on the line joining the two changes where electric field is zero? [3] 7. Define the term dipole moment P of an electric dipole indicating its direction. Write its S.I unit. An electric dipole is placed in a uniform electric field E . Deduce the expression for the Torque acting on it. [3] 8. (1) The electric field E due to a point change at any point near to it is defined as: q c F E Lim q ? = where q is the test charge and F is the force acting on it. What is the significance of lim q o ? in this expression? (2) Two charges each 2 x 10 -7 C but opposite in sign forms a system. These charges are located at points A (0,0, -10) cm and B(0,0, +10) cm respectively. What is the total charge and electric dipole moment of the system? [5] 9. (a) Sketch electric lines of force due to (i) isolated positive change (ie q>0) and (ii) isolated negative change ( ie q<0) (b) Two point changes q and â€“q are placed at a distance 2a apart. Calculate the electric field at a point P situated at a distance r along the perpendicular bisector of the line joining the charges. What is the field when r >> a? [5]Read More

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