Page 1 Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks CBSE TEST PAPER-05 CLASS - XII PHYSICS (Unit – Electrostatics) 1. The Plates of a charged capacitor are connected by a voltmeter. If the plates of the capacitor are moved further apart. What will be the effect on the reading of the voltmeter? [1] 2. What is the function of dielectric in a capacitor? [1] 3. A steam of electrons travelling with speed m s ? at right angles to a uniform electric field E is deflected in a circular path of radius r. Prove that 2 e v m rE = ? [2] 4. The distance between the plates of a parallel plate capacitor is d. A metal plate of thickness (d/2) is placed between the plates. What will be the effect on the capacitance? [2] 5. Keeping the voltage of the charging source constant. What would be the percentage change in the energy stored in a parallel plate capacitor if the separation between its plates were to be decreased by 10%? [3] 6. Two identical plane metallic surfaces A and B are kept parallel to each other in air separated by a distance of 1.0 cm as shown in the figure. Surface A is given a positive potential of 10V and the outer surface of B is earthed. (a) What is the magnitude and direction of uniform electric field between point Y and Z? What is the work done in moving a change of 20 c µ from point X to Y? (b) Can we have non-zero electric potential in the space, where electric field strength is zero? [3] A B X Y Z Page 2 Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks CBSE TEST PAPER-05 CLASS - XII PHYSICS (Unit – Electrostatics) 1. The Plates of a charged capacitor are connected by a voltmeter. If the plates of the capacitor are moved further apart. What will be the effect on the reading of the voltmeter? [1] 2. What is the function of dielectric in a capacitor? [1] 3. A steam of electrons travelling with speed m s ? at right angles to a uniform electric field E is deflected in a circular path of radius r. Prove that 2 e v m rE = ? [2] 4. The distance between the plates of a parallel plate capacitor is d. A metal plate of thickness (d/2) is placed between the plates. What will be the effect on the capacitance? [2] 5. Keeping the voltage of the charging source constant. What would be the percentage change in the energy stored in a parallel plate capacitor if the separation between its plates were to be decreased by 10%? [3] 6. Two identical plane metallic surfaces A and B are kept parallel to each other in air separated by a distance of 1.0 cm as shown in the figure. Surface A is given a positive potential of 10V and the outer surface of B is earthed. (a) What is the magnitude and direction of uniform electric field between point Y and Z? What is the work done in moving a change of 20 c µ from point X to Y? (b) Can we have non-zero electric potential in the space, where electric field strength is zero? [3] A B X Y Z Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks 7. Figure (a) and (b) shows the field lines of a single positive and negative changes respectively (a) Give the signs of the potential difference : B A and V -- V Vp Vq - (b) Give the sign of the work done by the field in moving a small positive change from Q to P. (c) Give the sign of the work done by the field in external agency in moving a small negative change from B to A. [5] 8. With the help of a labelled diagram, explain the principle, construction and working of a vandegraff generator. Mention its applications? [5]Read More

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