# electric charges and fields neet questions || electric charges and fields jee questions

*Dear students numericals of electric charges and fields neet questions and electric charges and fields jee questions aiims important questions have been collected at one place to get you all prepared for your neet, aiims ,jee main, advance exams as well as cbse board exams and other board exams. Visit my nawendu classes youtube channel for more help.*

electric charges and fields |

11.Two point charges of + 5 x ${{10}^{-19}}$C and + 20 x ${{10}^{-19}}$C are separated by a distance of 2 m. Find the point on the line joining them at which electric field intensity is zero.

Answer- –E/2

13. A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is

CBSE AIPMT 1998

Answer- qEy

14. There is an electric field ( E) in X-direction. If the work done in moving a charge 0.2 C through a distance of 2m along a line making an angle 60 degree with X-axis is 4J, the value of E is

Answer- 5 x ${{10}^{7}}$

AIIMS 2002

22.An electric dipole, consisting of two opposite charges of $2\times {{10}^{-6}}$ C each separated by a distance 3 cm is placed in an electric field of $2\times {{10}^{5}}$ N/C. Torque on the dipole is

CBSE AIPMT 1995

00. The potential at a point x (measured in $\mu $ m) due to some charges situated on the x-axis is given by V(x) = 20/ (x2– 4) volt.The electric field E at x = 4 $\mu $ m is given by

** ** AIEEE 2007

Answer- (10/9) V/$\mu $ m and in the +ve X direction

00. The electric potential V at any point x, y, z (all in metre) in space is given by $V=4{{x}^{2}}$volt. The electric field at the point (1m, 0, 2 m) is ......... V/m

IIT 1990, 1 M

Answer- $-8\hat{i}$

00. The electric potential at a point ( x,y,z ) is given by $V=-{{x}^{2}}y-x{{z}^{3}}+4$ . The electric field $\vec{E}$ at the point is

CBSE AIPMT 2009

00. In a region ,the potential is represented by $V\left( x,y,z \right)=6x-8xy-8y+6yz$. Where V in volts and x,y,z are in meters. The electric force experienced by a charge of 2 C situated at point (1,1,1) is

CBSE AIPMT 2014

27. A metallic solid sphere is placed in a uniform electric field . Which path is followed by the lines of force ?

28.In air, the value of the total electric flux emitted from unit positive charge is

CBSE AIPMT 2010

Answer- 0

30. A square surface of side L meter is in the plane of the paper. A uniform electric field E ( V/m ), also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is

CBSE AIPMT 2006

Answer- Zero

31. A charge q µC is placed at the centre of a cube of a side 0.1 m, then the electric flux diverging from each face of the cube is

CBSE AIPMT 2001

Answer- $\frac{q\times {{10}^{-6}}}{6{{\varepsilon }_{0}}}$

32. A charge Q $\mu $ C is placed at the center of a cube the flux coming out from any surface will be

Answer- $\frac{Q}{6{{\varepsilon }_{0}}}\times {{10}^{6}}$

33.A point charge +q is placed at mid-point of a cube of side L. The electric flux emerging from the cube is

CBSE AIPMT 1996

Answer- $\frac{q}{{{\varepsilon }_{0}}}$

34. A point charge of 2.0 $\mu $C is at the center of a cubic Gaussian surface 9.0 cm of edge. What is the net electric flux through the surface?

35. A charge q is placed at the corner of a cube of side a. The electric flux through the cube is

CBSE AIPMT 2000 ,2012

Answer- $\frac{q}{8{{\varepsilon }_{0}}}$

36. A point charge +10 µC is a distance 5 cm directly above the centre of a square of side 10 cm, as shown in Figure. What is the magnitude of the electric flux through the square? (Hint: Think of the square as one face of a cube with edge 10 cm.)

38. A hollow insulated conducting sphere is given a positive charge of 10 µC. What will be the electric field at the centre of the sphere if its radius is 2 m?

CBSE AIPMT 1996

CBSE AIPMT 2015

40.The electric field strength in air at NTP is $3\times {{10}^{6}}$ V/m. The maximum charge that can be given to a spherical conductor of radius 3 m is

CBSE AIPMT 1993

**# Assertion and Reason**

AIIMS 2012

AIIMS 2003

49. In a certain region of space, electric field is along the z-direction throughout. The magnitude of electric field is however not constant, but increases uniformly along the positive z-direction at the rate of ${{10}^{5}}$ $N{{C}^{-1}}{{m}^{-1}}$ . The force experienced by the system having a total dipole moment equal to ${{10}^{-7}}$ Cm in the negative z-direction is.

50. Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now, the strings are rigidly clamped at half the height. The equilibrium separation between the balls now becomes

NEET 2013

IIT 1992, 1 M

Answer- $\frac{1}{4\pi {{\varepsilon }_{0}}}.\frac{{{q}^{2}}}{{{L}^{2}}}$

55. Determine the electric dipole moment of the system of three charges, placed on the vertices of an equilateral triangle as shown in the figure.

IIT Main 2019, 12 Jan I

Answer- $-\sqrt{3}ql\hat{j}$

56. Obtain the formula for the electric field due to a long thin wire of uniform linear charge density E without using Gauss’s law. [Hint: Use Coulomb’s law directly and evaluate the necessary integral.]

57. A charged wire is bent in the form of a semicircular arc of radius a. If charge per unit length is λ coulomb/metre, the electric field at the centre O is

CBSE AIPMT 2000

Answer- $\frac{\lambda }{2\pi {{\varepsilon }_{0}}a}$

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