Subject: Physics, asked on 17/5/18

## Q). This side is extended to infinity. Now what will be the value of electric flux due to charge q. (Answer: $\frac{q}{24{\epsilon }_{0}}$

Subject: Physics, asked on 16/5/18

## Two concentric spheres are given equal amount of charge of the same nature then which may have higher potential

Subject: Physics, asked on 16/5/18

## Two short dipoles each of dipole moment p are placed at origin. The dipole moment of one dipole is along x axis and other is along y axis. The magnitude of electric field at a point (a,0)is given by

Subject: Physics, asked on 16/5/18

## 1) In the diagram shown the charge + Q is fixed. Another charge + 2q and mass M is projected from a distance R from the fixed charge. Minimum septation between the two charges if the velocity becomes times of the projected velocity, at this moment is. (Assume gravity to be absent)

Subject: Physics, asked on 16/5/18

## Q38 38. A point charge Q is located on the axis of a disc of radius R at a distance b from the plane of the disc (figure). Show that if one-fourth of the electric flux from the charge passes through the disc, then R= $\sqrt{3}$  b.

Subject: Physics, asked on 15/5/18

## Solve this: Q. In a certain region of space, variation of potential with distance from origin as we move along x-axis is given by V = 8${x}^{2}$ + 2, where x is the x-coordinate of a point in space. The magnitude of electric field at a point (- 4, 0) is (1) - 16 V/m (2) 16 V/m (3) - 64 V/m (4) 64 V/m

Subject: Physics, asked on 15/5/18

## Solve this: Q. Six point charges are placed at the vertices of a regular hexagon of side a as shown. If E represents electric field and V represents electric potential at O, then (1) E = 0 but V$\ne$0 (2) E $\ne$ 0 but V = 0 (3) E = 0 and V = 0 (4) E$\ne$ 0 and V$\ne$0

Subject: Physics, asked on 15/5/18

## Solve this: Q3. Electric potential in a region is varying according to the relation V = $\frac{3{\mathrm{x}}^{2}}{2}-\frac{{\mathrm{y}}^{2}}{4}$, where x and y are in metre and V is in volt. Electric field intensity (in N/C) at a point (1 m, 2 m) is            (1) 3$\stackrel{^}{\mathrm{i}}$– $\stackrel{^}{\mathrm{j}}$                                                     (2) –3$\stackrel{^}{\mathrm{i}}$+ $\stackrel{^}{\mathrm{j}}$            (3) 6$\stackrel{^}{\mathrm{i}}$– 2$\stackrel{^}{\mathrm{j}}$                                                   (4) – 6​ $\stackrel{^}{\mathrm{i}}$+ 2$\stackrel{^}{\mathrm{j}}$

Subject: Physics, asked on 15/5/18

## Solve this: 6. Electric charges having some magnitude of electric charge 'q' coulombs are placed at x=1 m, 2 m, 4 m, 8m..... so on. If any two consecutive charges have opposite sign but the first charge is necessarily positive, what will be the potential at x=0 ?

Subject: Physics, asked on 15/5/18

## Solve this: Q.28. Calculate the work done in taking a charge - 2$×{10}^{-9}$ C from A to B via C (in diagram) (1) 0.2 joule (2) 1.2 joule (3) 2.2 joule (4) zero

Subject: Physics, asked on 15/5/18

## Solve this: Q.24. Three charges - q, Q and - q are placed respectively at equal distances on a straight line. If the potential energy of the system of three charges is zero, then what is the ratio of Q : q? (1) 1 : 1 (2) 1 : 2 (3) 1 : 3 (4) 1 : 4

Subject: Physics, asked on 15/5/18

## Solve this: Q17. Determine the electric field strength vector if the potential of this field depends on x, y coordinates as V = 10 axy         (1) 10 a (y$\stackrel{^}{\mathrm{i}}$ + x$\stackrel{^}{\mathrm{j}}$)                                         (2) – 10 a ​[y$\stackrel{^}{\mathrm{i}}$ + x$\stackrel{^}{\mathrm{j}}$]                     (3) – a ​[y$\stackrel{^}{\mathrm{i}}$ + x$\stackrel{^}{\mathrm{j}}$]                                           (4) –10 a ​[x$\stackrel{^}{\mathrm{i}}$ + y$\stackrel{^}{\mathrm{k}}$]

Subject: Physics, asked on 15/5/18

## Solve this: Q. An electric dipole of length 2 cm is placed with its axis making an angle of 30$°$ to a uniform electric field ${10}^{5}$ N/C. If it experiences a torque of $10\sqrt{3}$ Nm, then potential energy of the dipole (1) - 10 J (2) - 20 J (3) - 30 J (4) - 40 J

Subject: Physics, asked on 15/5/18
Subject: Physics, asked on 15/5/18

## Solve this: Three isolated equal charges are placed at the three corners of an equilateral triangle as shown in figure. The statement which is true for net electric potential V and net electric field intensity E at the centre of the triangle is

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