Introduction to Computer

Topics: Electric charge, Electric potential, Magnetic field Pages: 3 (408 words) Published: November 13, 2012
CBSE TEST PAPER-05 CLASS - XII PHYSICS (Unit – Electrostatics)


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?


2. 3.

What is the function of dielectric in a capacitor? A steam of electrons travelling with speed υ 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?



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%?



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 µ c from point X to Y? (b) Can we have non-zero electric potential in the space, where electric field strength is zero?




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Figure (a) and (b) shows the field lines of a single positive and negative changes respectively


(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.


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