Electric Field and Potential Questions and Answers

sphere An infinite line charge produces a field of 9 104 N C at a distance of 2 cm Calculate the linear charge density

A proton and an electron are placed 1 6 cr in free space Find the magnitude of elect force between them What is the nature force

Figure shows a shell of radius R having charge q uniformly distributed over it A point charge q is placed at the centre of shell Find work required to increase radius of shell from R to R as shown in fiugre b R a

value of the point charge 1 A conducting sphere of radius 10 cm has an unknown charge the electric field 20 cm from the centre of the sphere is 1 5 x 10 N and points radially inward what is the net charge on the sphere A uniformly charged conducting sphere of 2 4 m diameter has d the charge on t

An electric dipole consists of two equal and opposite point charges and 9 separated by a distance 2 P is a point collinear with the charges such that its distance from the positive charge is half of its distance from the negative charge The electric intensity at P is 1 30 Ans 4 16 densities

capacitar 30 Eight identical spherical drops each carrying a charge 1 nC are at a potential of 900 V each All these drops combine together to form a single large drop Calculate the potential of this large drop Assume no wastage of any kind and take the capacitance of a sphere of radius r as proportional to r 3600 V hotton of volts The charge stored in it is 360 uC When potentia

Two long current carrying thin wires both with current I are held by insulating threads of length L and are in equilibrium as shown in the figure with threads making an angle 0 with the vertical If wires have mass per unit length then the value of I is g gravitational acceleration 1 2 sine 3 gL VHo cose ngL Ho tane 2 2 ngL Ho 4 sine tane gL Ho Cose I 2015

01 Two infinitely large sheets having charge densities and 2 respectively 01 02 are placed near each other separated by distance d A charge q is placed in between two plates such that there is no effect on charge distribution on plates Now this charge is moved at an angle of 45 with the horizontal towards plate having charge density 2 by distance a a d Find the work done by electric field in the process 02 B a A45 2005 2004

point charge q is placed at distance R 2 from its centre C Also there is a charge 2q 1 K 4ca E placed outside the shell at a distance of 2R as shown Then K R 2 9 3q C 2R 2q 48 A the magnitude of electric field at the centre C due to charges on the outer surface of Ka shell is before closing the switch S 2R B the electric potential at the centre C due to charges on the outer surface of shell is Kq before closing the switch S R C the electric potential at the centre C due to charges on the outer surface of shell is Kq after closing the switch S R

100 mm The en charged particles are kept fixed on the X axis at point x 10 mm 20 mm 30 mm st particle has a charge 10 C the second 8 x 10 C the third 27 x 10 C and so on The tenth particle as a charge 1000 x 10 C Find the magnitude of electric force acting on a 1 C charge placed at the origin 1C 91 92 93 94 C

Statement I Two concentric charged shell are given The potential difference between the shells depends on charge of inner shell BA Statement II Potential due to charge of outer shell remains same at every point inside the sphere

Q 29 1 0 30 1 Questions Q 29 Q 30 Each of these questions contains two statements Statement I and Statement II Each of these has four alternatives choices You have to select the correct choice 1 If both Statement I and Statement II are true and Statement II is the correct explanation of Statement I 2 If both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I 3 If Statement I is true but Statement II is false 4 If Statement I is false but Statement II is true Statement I In a free fall weight of a body becomes effectively zero Statement II Acceleration due to gravity acting on a body having free fall is zero Statement I Two concentric charged shell are given The potential difference between the shells depends on charge of inner shell BA Statement II Potential due to charge of outer shell remains same at every point inside the sphere

a Very Short Answer Questions REFLECTION OF LIGHT 2 1 What is meant by a self luminous source What is a transparent medium How do you define a beam 3 4 Draw the diagram of a convergent beam How do you define the angle of incidence How do you define angle of reflection How are angles of incidence and angle of reflection related to each other 5 6 7 8 Mention one characteristic of image produced by a plane mirror 9 What is the magnification of image produced by a plane mirror 10 A boy is running a way from a plane mirror with a speed of 10 ms What is his relative speed with respect to his image 11 A clock showing time as 11 45 is placed in front of a plane mirror What time will be observed through the mirror 12 What is the distance between centre of curvature and pole of a concave mirror in terms of its focal length What do you mean by principle axis of a spherical mirror 13 14 An object is placed at the centre of curvature of a concave mirror Where will its image be obtained 15 For what purpose do we use a parabolic mirror

A hollow spherical shell of radius r has a uniform charge density o It is kept in a cube of edge 3r such that the center of the cube coincides with the center of the shell Calculate the electric flux that comes out of a face ot not 2r 0 of the cube Ans

3 The total energy of electron in the ground state of hydrogen atom is 13 6 eV The kinetic energy of an electron in the first excited state is AIPMT Prelims 2007 1 1 7 eV 2 3 4 eV 3 6 8 eV

1 Charge q2 of mass m revolves around a stationary charge q in a circular orbit of radius r The orbital periodic time of 92 would be 1 3 4 mr kq 92 4x mr kq 92 71 2 71 2 2 4 49192 4x mr 71 2 4 mr kq192 11 2