Introduction to Computer

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. 3. What is the function of dielectric in a capacitor? A steam of electrons travelling with speed ? m s at right angles to a uniform e v2 = ? m rE [1] [2] electric field E is deflected in a circular path of radius r. Prove that 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 Â µ c from point X to Y? (b) Can we have non-zero electric potential in the space, where electric field strength is zero? [3]B A X Z Y 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 [5] a) Give the signs of the potential difference : Vp ? Vq and VB — VA (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. 8. With the help of a labelled diagram, explain the principle, construction and working of a vandegraff generator. Mention its applications? [5] Mate rial downloaded from http://myCBSEguide. com and http://onlineteachers. co. in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks