Two charges `14 mu C` and `-4 mu C` are placed at (-12cm,0,0) and (12cm,0,0) in an external electric field `E=((B)/(r^(2)))`,where `B=1.2times10^(6)``N/(cm^(2))` and "r" is in metres.The electrostatic potential energy of the configuration is

(a) 97.9J

(b) 102.1J

(c) 2.1J

(d) -97.9J

Two charges of magnitude 5 nC and -2 nC are placed at points (2cm,0,0) and (x cm,0,0) in a region of space. Where there is no other external field. If the electrostatic potential energy of the system is -0.5 muJ . What is the value of x ?

(a) Determine the electrostatic potential energy of a system consisting of two charge 7 muC and -2 muC (and with no external field) placed at (-9 cm, 0,0) and (9 cm, 0,0) respectively. (b) How much work is required to seperate 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 xx 1//r^(2) , where A = 9xx10^(5) C m^(-2) . What would the electrostatic energy of the configuration be ?

For a inductor coil L = 0.04 H, then workdone by source to establish a current of 5A in it is - (a) 0.5 J (b) 1.00 J (c) 100 J (d) 20 J

If the points A(1,2) , B(0,0) and C (a,b) are collinear , then

Three charges q_1 = 1 mu C, q_2 = -2 mu C, and q_3 = -1 mu C are placed at A (0,0,0), B(-1 , 2,3,) and C (2 , -1, 1) . Find the potential of the system of three charges at P( 1, - 2, -1) .

Two charges q_(1) = 3.0 mu C and q_(2) = - 4.0 mu C initiallly are separated by a distance r_(0) = 2.0 cm . An external agent moves the charges until they are r_(f) = 5.0 cm apart. How much work is done by the electric field in moving the charges from r_(0) to r_(f) ? Is the work positive or negative ?

Three particles, each having a charge of 10 mu C are placed at the coners of an equilateral triangle of side 10 cm . The electrostatic potential energy of the system is (Given (1)/(4pi epsilon_(0)) = 9 xx 10^(9)N-m^(2)//C^(2))

The projection of the vector hat i+ hat j+ hat k along the vector of hat j is 1 b. 0 c. 2 d. -1 e. -2

The kinetic energy of two moles of N_(2) at 27^(@) C is (R = 8.314 J K^(-1) mol^(-1))

Two charges of 4 mu C each are placed at the corners A and B of an equilaternal triangle of side length 0.2 m in air. The electric potential at C is [(1)/(4pi epsilon_(0)) = 9 xx 10^(9) (N-m^(2))/(C^(2))]