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THIS VIDEO LECTURE INCLUDES
1. SOLUTION OF SOLVED EXAMPLE 2.1 TO 2.5 OF CHAPTER 2 ELECTROSTATIC POTENTIAL AND CAPACITANCE CLASS 12 NCERT PHYSICS PART 1 ANSWERS
2. EXAMPLE 2.1
A.CALCULATE THE POTENTIAL AT A POINT P DUE TO A CHARGE OF 4 X 10^- 7 COULOMB LOCATED 9 CM AWAY
B.HENCE OBTAIN THE WORK DONE IN BRINGING A CHARGE OF 2 X 10^-9 COULOMB FROM INFINITY TO THE POINT P A STOCK DOES THE ANSWER DEPEND ON THE PATH ALONG WHICH THE CHARGE IS BROUGHT?
3. EXAMPLE 2.2
TWO CHARGES 3 X 10^-8CAND 2 X 10^ 8 C ARE LOCATED 15 CM APART. AT WHAT POINT ON THE LINE JOINING THE TWO CHARGES IS THE ELECTRIC POTENTIAL ZERO? TAKE THE POTENTIAL AT INFINITY TO BE ZERO.
4. EXAMPLE 2.3
FIGURE 2.8 A AND B SHOW THE FIELD LINES OF A POSITIVE AND NEGATIVE POINT CHARGE RESPECTIVELY
A.GIVE THE SIGNS OF THE POTENTIAL DIFFERENCE V P - V Q AND V B - V A
B.GIVE THE SIGN OF THE POTENTIAL ENERGY DIFFERENCE OF A SMALL NEGATIVE CHARGE BETWEEN THE POINTS Q AND P ,A AND B
C.GIVE THE SIGN OF THE WORK DONE BY THE FIELD IN MOVING A SMALL POSITIVE CHARGE FROM Q TO P.
D.GIVE THE SIGN OF THE WORK DONE BY THE EXTERNAL AGENCY IN MOVING A SMALL NEGATIVE CHARGE FROM B TO A.
E.DOES THE KINETIC ENERGY OF A SMALL NEGATIVE CHARGE INCREASE OR DECREASE IN GOING FROM B TO A?
5. EXAMPLE 2.4
FOUR CHARGES ARE ARRANGED AT THE CORNERS OF A SQUARE ABCD OF SIDE D AS SHOWN IN FIGURE 2.15
A. FIND THE WORK REQUIRED TO PUT TOGETHER THIS ARRANGEMENT
B.A CHARGE Q0 IS BROUGHT TO THE CENTRE OF THE SQUARE, THE FOUR CHARGES BEING HELD FIXED AT ITS CORNERS. HOW MUCH EXTRA WORK IS NEEDED TO DO THIS?
6. EXAMPLE 2.5
A.DETERMINE THE ELECTROSTATIC POTENTIAL ENERGY OF A SYSTEM CONSISTING OF TWO CHARGES 7 MICROCOULOMB AND- 2 MICROCOULOMB AND WITH NO EXTERNAL FIELD PLACED AT (- 9,0,0) AND (9,0,0) RESPECTIVELY
B.HOW MUCH WORK IS REQUIRED TO SEPARATE THE TWO CHARGES INFINITELY AWAY FROM EACH OTHER
C.SUPPOSE THAT THE SAME SYSTEM OF CHARGES IS NOW PLACED IN AN EXTERNAL ELECTRIC FIELD E =A(1/R^2), WHERE A = 9 X 10 ^5 NEWTON PER COULOMB METRE SQUARE. WHAT WOULD THE ELECTROSTATIC ENERGY OF THE CONFIGURATION BE?

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