NEET Questions - Physics - Electrostatics

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The protonic charge in 100 gm of water is________- c

$ 4.8 \times 10^{5} $
$ 5.4 \times 10^{6} $
$ 3.6 \times 10^{4} $
$ 4.9 \times 10^{6} $

A copper sphere of mass 2 gm contains about $ 2 \times 10^{22} $ atoms. The charge on the nucleus of each atom is 29e. The fraction of electrons removed.

$ 2 \times 10^{-10} $
$ 1.19 \times 10^{-12} $
$ 1.25 \times 10^{-11} $
$ 2.16 \times 10^{-11} $

The rate of alpha partical falls on neutral spheare is $10^{12} $ per second. The time in which sphere gets charged by 2 c is sec.

2.25
3.15
6.25
1.66

A charge Q is divided into two parts and then they are placed at a fixed distance. The force between the two charges is always maximum when the charges are .........

Q/3 ,Q/3
Q/2, Q/2
Q/4, 3Q/4
Q/5 , 4Q/5

Two small conducting sphere of equal radius have charges + 1 c and – 2 c respectively and placed at a distance d from each other experience force $F_1$. . If they are brought in contact and separated to the same distance, they experience force $F_2$. The ratio of $F_1 to F_2$ is ..........

-8:1
1:02
1:08
-2 : 1

Two equal negative charges –q are fixed at points (o, a) and (o, –a). A positive charge Q is released from rest at the point (2a, o) on the X - axis. The charge Q will

move to the origin and remain at rest there
execute simple harmonic motion about the origin
move to infinity
execute oscillations but not simple harmonic motion

Four charges, each equal to –Q, are placed at the corners of a square and a charge +q is placed at its centre. If the system is in equilibrium, the value of q is

$ { Q \over 4 } ( 1 + 2 \sqrt 2 ) $
$ - { Q \over 4 } ( 1 + 2 \sqrt 2 ) $
$ -{ Q \over 2} ( 1 + 2 \sqrt 2 ) $
$ { Q \over 2 } ( 1 + 2 \sqrt 2 ) $

Two identical charged spheres suspended from a common point by two massless strings of length l are initially a distance d (d << l ) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the spheres approach each other with a velocity υ . Then function of distance x between them becomes ...........

$ \upsilon \alpha x $
$ \upsilon \alpha x^{-1 \over 2 } $
$ \upsilon \alpha x^{-1 } $
$ \upsilon \alpha x^{1 \over 2 } $

Three identical spheres each having a charge q and radius R, are kept in such a way that each touches the other two spheares. The magnitude of the electric force on any sphere due to other two is ...........

$ {R \over 2 } { 1 \over 4 \pi \epsilon _0 } { \sqrt 5 \over 4 } \left ( { q \over R } \right ) ^2 $
$ { 1 \over 8 \pi \epsilon _0 } { \sqrt 2 \over 3 } \left ( { q \over R } \right ) ^2 $
$ { 1 \over 4 \pi \epsilon _0 } { \sqrt 3 \over 4 } \left ( { q \over R } \right ) ^2 $
$ - { 1 \over 8 \pi \epsilon _0 } { \sqrt 3 \over 2 } \left ( { q \over R } \right ) ^2 $

Two equal negative charges –q are fixed at points (o, a) and (o, –a) on the Y axis. A positive charge q is released from rest at the point x (x < < a) on the X-axis, then the frequency of motion

$ \sqrt { q^2 \over \pi \epsilon _0 ma ^2} $
$ \sqrt { 2q^2 \over 4 \pi \epsilon _0 ma ^3} $
$ \sqrt { 4 q^2 \over 2 \pi \epsilon _0 ma ^3} $
$ \sqrt { q^2 \over 2 \pi \epsilon _0 ma ^3} $

A point charge q is situated at a distance r from one end of a thin conducting rod of length L having a charge Q (uniformly distributed along its length). The magnitude of electric force between the two, is ...............

$ { 2 kqQ \over r(r+L) } $
$ { kqQ \over r(r+L) } $
$ { kqQ \over r(r-L) } $
$ { kQ \over r(r+L) } $

Two point charges of +16 c and –9 c are placed 8 cm apart in air distance of a point from –9 c charge at which the resultant electric field is zero.

24 cm
9 cm
16 cm
35 cm

Point charges 4 c and 2 c are placed at the vertices P and Q of a right angle triangle PQR respectively. Q is the right angle,$PR=2 \times10^{–2}m $ and $QR =10^{–2}m$ . The magnitude and direction of the resultant electric field at c is .........

$ 4.28 \times 10^9 NC^{–1} , 45 $
$ 2.38 \times 10^8 NC^{–1} , 40.9 $
$ 1.73 \times 10^4 NC^{-1}, 34.7 $
$ 4.9 \times 10^{10} NC^{–1} , 34.7 $

A small sphere whose mass is 0.1 gm carries a charge of $ 3 \times 10^{–10}C $ and is tieup to one end of a silk fibre 5 cm long. The other end of the fibre is attached to a large vertical conducting plate which has a surface charge of $ 25 \times 10^{–6}Cm^{–2}$ , on each side. When system is freely hanging the angle fibre makes with vertical is

$ 41.8 ^\circ $
$ 45 ^\circ $
$ 40.2 ^\circ $
$ 45.8 ^\circ $

A Semicircular rod is charged uniformly with a total charge Q coulomb. The electric field intensity at the centre of curvature is

$ 2KQ / \pi r^2 $
$ 3KQ / \pi r^2 $
$ KQ / \pi r^2 $
$ 4KQ / \pi r^2 $

NEET Physics Questions: Electrostatics