15.Four charges q1, q2,q3,q4 are situated at four corners of square. Find potential at centre? q1=18nc q2=-24nc q3=35nc q4=64nc

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Four chargers $q_{1} = - 0.02 μ C$ , $q_{2} = + 0.04 μ C$ , $q_{3} = + 0.02 μ C$ , and $q_{4} = - 0.04 μ C$ are at the four corners of a square of side $9 c m$ . Then the potential at the centre of the square is :

q_{1}, q_{2}, q_{3} a n d q_{4}

are point charges located at points as shown in the figure and S is spherical Gaussian surface of radius R. Which of the following is true according to the Gauss’s law.

Q. Assertion :Four point charges

q_{1}

q_{2}

q_{3}

and

q_{4}

are as shown in figure. The flux over the shown Gaussian surface depends only on charges

q_{1}

and

q_{2}

. Reason: Electric field at all points on Gaussian surface depends only charges

q_{1}

and

q_{2}

Q. Four charges

q_{1} = 1 μ C, q_{2} = 2 μ C, q_{3} = - 3 μ C

and

q_{4} = 4 μ C

are kept on the vertices of a square of side

1 m

. Find the electric potential energy of this system of charges.

Q. Four charges

q_{1} = 1 μ C

q_{2} = 2 μ C

q_{3} = - 3 μ C

and

q_{4} = 4 μ C

are kept on the vertices of a square of side

1 m

. Find the electric potential energy stored in this system of charges.

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