WorksheetsElectroStats
Total questions: 15
Worksheet time: 42mins
One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge. Then,
Mass of A and mass of B still remain equal
Mass of A increases
Mass of B decreases
Mass of B increases
Two point charges A and B, having charges +Q and –Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges become
9F/16
16F/9
4F/3
F
Two identical charged spheres suspended from a common point by two massless strings of lengths l, are initially at a distance d (d << l) apart because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity v. Then, v varies as a faction of the distance x between the sphere, as
A
B
C
D
Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge on an electron)
A
B
C
D
Read the Question In Image and mark A/B/C/D as given against each option
A
B
C
D
A charge q is placed at the centre of the line joining two exactly equal positive charges Q. The system of three charges will be in equilibrium, if q is equal to
– Q/4
+Q
–Q
Q/2
An electric dipole, consisting of two opposite charges of 2×10^(-6) C each separated by a distance 3 cm is placed in an electric field of 2×10^5 N/C. Torque on the dipole is
12 × 10–1 N-m
12 × 10–2 N-m
12 × 10–3 N-m
12 × 10–4 N-m
Three point charge +q,-2q and +q are placed at point (x=0,y=a,z=0), (x=0,y=0,z=0) and (x=a,y=0,z=0), respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are:
√2 qa along +y direction
√2 qa along the line joining point (x=0,y=0,z=0) and (x=a,y=a,z=0)
qa along the line joining points (x=0,y=0,z=0) and (x=a,y=a,z=0)
√2 qa along +x direction
An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is [NEET 2018]
10 times greater
smaller
5 time greater
equal
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
A
B
C
D
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
qEy2
qE2y
qEy
2qE2y
A charge Q is placed at the corner of a cube. The electric flux through all the six faces of the cube is:
A
B
C
D
A square surface of side L meter in the plane of the paper is placed in a uniform electric field E (volt/m) acting along the same plane at an angle q with the horizontal side of the square as shown in figure. The electric flux linked to the surface, in units of volt-m, is
zero
EL2
EL2cosTHETA
EL2sinTHETA
A hollow cylinder has a charge q Coulomb within it. If f is the electric flux in units of voltmetre associated with the curved surface B, the flux linked with the plane surface A in units of voltmetre will be (charge is symmetrically placed within it)
A
B
C
D
A dipole is placed inside the cube find flux through the cube?
Zero
1
2
3
