Introduction to Computer
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. 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?
[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 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
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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
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. 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?
[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 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