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## ELECTROSTATICS

Q.01    The magnitude of the charge on an electron is approximately:
a) 10 23C
b) 10 -23C
c) 10 19C
d)10 -19C

Q.02    The charge on a glass rod that has been rubbed with silk by arbitrary convention will be:
a) Negative
b) positive
c) Sometime negative sometime positive
d) None of these

Q.03    Two small charged objects attract each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:
a) F/16
b) F/8
c) F/4
d) F/2

Q.04    Coulomb Law is also known as
a) Electrostatic Law
b) Force Law
c) Inverse Square Law
d) None

Q.05    S.I unit of permittivity of free space is
b) Weber
c) c2/N.m2
d) c2/N.m

Q.06       Capacity of a capacitor depends upon
a) Size of plate
b) Distance b/w plates
c) Nature of dielectric b/w plates
d) All of above

Q.07    When capacitors are connected in parallel the net capacitance will
a) Increase
b) Decrease
c) Constant
d) None of these

Q.08    A charge of 2c is in a field of intensity 2N/C, the force on the charge is
a) 1 N
b) 4 N
c) 4pi N
d) 0 N

Q.09    The relative permittivity of oil at room temperature is 3. Two charges with force of repulsion 9N between them, immersed in oil. The force between the charges will be:
a) 1/6 th of its value
b) 1/3 rd of its value
c) 3 times of its value
d) None of these

Q.10   A cell does five joules of work in carrying 10 coulomb of charge around a closed circuit, the e.m.f of the cell is
a) 0.5V
b) 5V
c) 10V
d) None of these

Q.11   A capacitor stores a charge of 20µc while working across of battery of 200V, the energy stored by the capacitor is:
a) 2000 J
b) 200 J
c) 20 J
d) None of these

Q.12  Charge is stored uniformly between two charged plates of electric intensity 200V/m and potential difference 10 volt , the distance between the plates is
a) 0.05m
b) 0.5 m
c) 5m
d) None of these

Q.13    The separation b/w plates of a capacitor is 4 mm. if the voltage across the plates is 50 volts then the electric field intensity is
a)12.5 X 103 N/C
b) 1.25 X 103 N/C
c) 125 X 103 N/C
d) None of these

Q.14    The minimum charge on an abject is
a) 1 coulomb
b) 1 state coulomb
c) 1.6 x 10-19
d) None of these

Q.15    A 5µF capacitor has a potential difference of 200Volts across its plates. The charge on the capacitor is:
a) 2.5x10-8 C
b) 10-3 C
c) 103 C
d) 10-6C

Q.16    The work done in moving a charge along an equipotential surface is
a) Depends on the path taken
b) Greater then zero
c) Equal to zero
d)Negative

Q.17    A charge of 0.01c accelerated through a p.d of 1000v acquires K-E?
a) 10 J
b) 100 J
c) 200 J
d) 400 eV

Q.18    If the charge on the particle is double then electric field is
a) Half
b) Double
c) Unchanged
d) None

Q.19    The electric potential at a point of distance 1 m from 2 uc charge is
a) 1.8 x 106 V
b) 1.8 x 106 N/C
c) 1.8 x 104 V
d) 1.8 x 105 V

Q.20    A parallel plate capacitor has a capacitance of 5µF when air is filled between its plates. When the space between plates is filled with porcelain sheet its capacitance is 30µF. then the relative permittivity of the dielectric will be:
a) 1/6
b) 3
c) 9x109
d) 6

Q.21    The work done in carrying alpha particle across the potential difference of one volt in joules                is:
a) 1.6x10-19 J
b) 3.2x10-19 J
c) 0.8x10-19 J
d) Zero

Q.22    Electric field intensity is also known as
a) Electric potential
b) Electric flux
d) None

Q.23    Individual capacitance is greater than the equivalent capacitance when connected in:
a) Parallel
b) Series
c) Both
d) None of these

Q.24    The path adopted by free positive charge in an electric field is called:
a) Electric lines of force
b) Electric flux
c) Magnetic flux
d) None of these

Q.25    When the electric lines of force is parallel then the electric field is:
a) Strong
b) Weak
c) Uniform
d) Non uniform

Q.26    The S.I Unit of electric flux is:
a) V/m
b) V.m
c) NCm-1
d) None of these

Q.27    Reciprocal of equivalent capacitance is equals to the sum of all capacitors when connected in:
a) Series
b) Parallel
c) Both
d) None of these