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WorksheetsPhysics XII
Total questions: 20
Worksheet time: 40mins
When a glass rod is rubbed with silk, it
gains electrons from silk
gives electrons to silk
gains protons from the silk
gives proton to silk
In general metallic ropes are suspended on the carriers taking inflammable material. The reason is
to control the speed of carrier
to keep the center of gravity of carrier nearer to the earth
to keep the body of carrier nearer to the earth
none of these
Two similar spheres having +Q and -Q charges are kept at a certain distance F force acts between the two. If at the middle of two spheres another similar sphere having +Q charge is kept, then it experiences a force in magnitude and direction as
zero having no direction
8F towards +Q charge
8F towards -Q charge
4F towards +Q charge
A charge Q is divided into two parts q and Q -q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be
2:1
1/2
4:1
1/4
The electric field inside a spherical shell of uniform surface charge density is
zero
constant, less than zero
directly proportional to the distance from the center
none of these
Electric field at a point varies as r2
an electric dipole
a point charge
a plane infinite sheet of charge
a line charge of infinite length
The SI unit of electric flux is
NC-1 m-2
NC m-2
NC-2 m2
NC-1 m2
The unit of electric dipole moment is
newton
coulomb
farad
coulomb meter
The surface considered for Gauss's Law is called
closed surface
spherical surface
Gaussisan surface
Plane surface
The total flux through the faces of the cube with side of length a if a charge q is placed at center of the cube is
q/8ε0
q/4ε0
q/2ε0
q/ε0
How many electrons are there in one coulomb
6.25 x 1018
62.5 x 10 18
6.023 x 1023
1.6 x 10-19
SI unit for surface integral of electric field is
V/m
V
NC-1 m
Cm-3
Value of charge q at the center of two equal and like charges Q so that three are in equilibrium is
Q
Q/4
-Q/4
Q/2
When an electric dipole is placed in uniform electric field, it experiences
force as well as torque
torque but no net force
Force but no torque
Neither any force nor any torque
An electric dipole having dipole moment P is placed in uniform electric field E. What should be the angle between P and E so that equilibrium of dipole moment is unstable
1800
900
00
none of these
Electric field at the centroid of the triangle carrying charge q at each corner is
2kq/r2
kq/r2
3kq/r2
0
When 1014 electrons are removed from neutral metallic sphere. The charge on the sphere becomes (a)
two charges q1 and q2 are placed in vaccum at a distance d and the force acting between them is F. if a medium of dielectric constant 4 is introduced around them, the force now will be (a)
The electric constant for metal is (a)
if radius of Gaussian surface is doubled, then electric flux gets (a) -
