Thursday, 28 May 2015

CLASS XII PRACTICE PAPER[ELECTROSTATICS]



BY- UTTAM SINGH PAL

UNIT-1



1-        What is principle of working of meter- Bridge?   1
2-      When is a Wheatstone bridge said to be balanced?        1
3-      State and explain Kirchhoff’s rules?     3
4-       A wire is carrying a current. Is charged?   1
5-      What is non-ohmic device? Give example?   2
6-      A 4Ω non insulated resistance wire is bent in the middle by 1800 and both the halves are twisted with each other.                                               What will be its new resistance?     2
7-       How is the current conducted in metals?     Explain.  2
8-      Define resistance of a conductor, what is its cause? Explain the factors on which the resistance of a conductor depends. 3
9-       IF A BODY GIVES OUT 109 ELECTRONS EVERY SECOND HOW JKKNUCH TIME IS REQUIRED TO GET A TOTAL CHARGE OF 1C FROM IT?        2
10-     CAN TWO SIMILARLY CHARGED BALLS ATTRACT                      EACH OTHER?                           1                                                                     
11-       NAME ANY TWO BASIC PROPERTIES OF ELECTRIC CHARGE.     1                                                                                    
12-      WHAT IS THE CAUSE OF CHARGING?        1
13-      DOES COULOMB’S LAW OF ELECTRIC FORCE OBEY NEWTONS THIRD LAW OF MOTION.        1
14-      EXPLAIN THE PHENOMENON OF CHARGING BY INDUCTION.      3
15-      AN ELECTRIC DIPOLE CONSIST OF TWO CHARGES OF +- 0.1µC SEPARATED BY A DISTANCE OF 2.0 CM. THE DIPOLE IS PLACED IN  AN EXTERNAL FIELD OF  105N/C. WHAT MAXIMUM TORQUE DOES THE FIELD EXERT ON THE DIPOLE.                  3
16-      WHAT IS A CAPACITOR? DEFINE CAPACITANCE. DISCUSS ITS UNITS.               3
17-      THE CAPACITOR C C2 AND C3. FIND EQUIVALENT CAPACITANCE IN SERIES AND PARALLEL.        5
18-      DEDUCE COULOMB’S LAW FROM GAUSS’S THEOREM.               2
19-      STATE GAUSS’S LAW IN ELECTOSTATICS               1

20-   FIND ELECTRIC FIELD INTENSITY DUE TO AN INFINITELY LONG STRAIGHT UNIFORMLY CHARGED WIRE.       2

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