1. The distance between the two charges \[25 \mu C\] and
\[36 \mu C\] is 11cm At what point on the line joining
the two, the intensity will be zero
a) At a distance of 5 cm from \[25 \mu C\]
b) At a distance of 5 cm from \[36 \mu C\]
c) At a distance of 10 cm from \[25 \mu C\]
d) At a distance of 11 cm from \[36 \mu C\]
Explanation:
2. Two spheres A and B of radius 4 cm and 6 cm are
given charges of \[80 \mu C\] and \[40 \mu C\] respectively. If
they are connected by a fine wire, the amount of
charge flowing from one to the other is
a) \[20 \mu C\] from A to B
b) \[16 \mu C\] from A to B
c) \[32 \mu C\] from B to A
d) \[32 \mu C\] from A to B
Explanation:
3.A charge particle is free to move in an electric
field. It will travel
a) Always along a line of force
b) Along a line of force, if its initial velocity is
zero
c) Along a line of force, if it has some initial
velocity in the direction of an acute angle with
the line of force
d) None of the above
Explanation: Because E points along the tangent to the lines of force. If initial velocity is zero, then due to the force, it always moves in the direction of E. Hence will always move on some lines of force.
4. If E is the electric field intensity of an
electrostatic field, then the electrostatic energy
density is proportional to
a) E
b) \[E^{2}\]
c) \[1/E^{2}\]
d) \[E^{3}\]
Explanation:
5. A metallic sphere has a charge of \[10\mu C\] . A unit
negative charge is brought from A to B both
100 cm away from the sphere but A being east of
it while B being on west. The net work done is
a) Zero
b) 2 /10 joule
c) -2 /10 joule
d) -1 /10 joule
Explanation:
6. Two charges \[+4e\] and \[+e\] are at a distance x apart.
At what distance, a charge q must be placed from
charge \[+e\] so that it is in equilibrium
a) \[x/2\]
b) \[2x/3\]
c) \[x/3\]
d) \[x/6\]
Explanation:
7. An uncharged sphere of metal is placed in
between two charged plates as shown. The lines
of force look like
a) A
b) B
c) C
d) D
Explanation: Electric lines of force never intersect the conductor. They are perpendicular and slightly curved near the surface of conductor
8. The intensity of electric field required to balance
a proton of mass \[1.7\times 10^{-27}kg\] and
charge \[1.6\times 10^{-19}C\] is nearly
a) \[1\times 10^{-7}V/m\]
b) \[1\times 10^{7}V/m\]
c) \[1\times 10^{-5}V/m\]
d) \[1\times 10^{5}V/m\]
Explanation:
9.On rotating a point charge having a charge q
around a charge Q in a circle of radius r. The work
done will be
a) \[q\times 2\pi r\]
b) \[\frac{q\times 2\pi Q}{r}\]
c) Zero
d) \[\frac{ Q}{2\epsilon_{0}r}\]
Explanation: Since charge Q moving on equipotential surface so work done is zero
10. Two point charges Q and – 3Q are placed at some
distance apart. If the electric field at the location
of Q is E then at the locality of -3 Q , it is
a) -E
b) E/3
c) -3E
d) -E/3
Explanation:
