Questions No:1
Two equal positive charges are kept at points A and B. The electric potential at the points between A and B (excluding these points) is studied while moving from A to B. The potential
[A] continuously increases
[B] continuously decreases
[C] increases then decreases
[D] decreases then increases
Questions No:2
A uniform electric field having a magnitude E0 and direction along the positive X-axis exists. If the potential Vis zero at x = 0, then its value at X = + x will be
[A] +xE0
[B] -xE0
[C] +\(x^2\)E0
[D] –\(x^2\)E0
Questions No:3
A charge of 5 C experiences a force of 5000 N when it is kept in a uniform electric field. What is the potential difference between two points separated by a distance of 1 cm?
[A] 10 V
[B] 250V
[C] 1000 V
[D] 2500V
Questions No:4
The electric potential V is given as a function of distance x (metre) by V = (5x2 +10x -9) volt. Value of electric field at x = 1 is
[A] – 20 V/m
[B] 6 V/m
[C] 11 V/m
[D] -23 V/m
Questions No:5
Two plates are at potentials -10 V and +30 V. If the separation between the plates be 2 cm. The electric field between them is
[A] 2000 V/m
[B] 1000 V/m
[C] 500 V/m
[D] 3000 V/m
Questions No:6
Charges 2q, – q and – q lie at the vertices of an equilateral triangle. The value of E and Val the centroid of the triangle will be
[A] E ≠ 0 and V ≠ 0
[B] E=0 and V=0
[C] E ≠ 0 and V=0
[D] E=0 and V ≠ 0
Questions No:7
In a uniform electric field a charge of 3 C experiences a force of 3000 N. The potential difference between two points 1 cm apart along the electric lines of force will be
[A] 10 V
[B] 100 V
[C] 30V
[D] 300V
Questions No:8
From a point charge there is a fixed point A. At that point there is an electric field of 500 V/m and potential of 3000 V. Then the distance of A from the point charge is
[A] 6m
[B] 12 m
[C] 36m
[D] 144m
Questions No:9
If E is the electric field intensity of an electrostatic field, then the electrostatic energy density is proportional to
[A] E
[B] E2
[C] \( \frac{1}{ E^2} \)
[D] E3
Questions No:10
A particle A has charge +q and a particle B has charge +4g with each of them having the same mass m. When allowed to fall from rest through the same electric potential difference, the ratio of their speed \( \frac{V_A}{ V_B} \) will become
[A] 2:1
[B] 1:2
[C] 1 : 4
[D] 4 : 1
Questions No:11
Three particles, each having a charge of 10 µ C are placed at the corners of an equilateral triangle of side 10 cm. The electrostatic potential energy of the system is (given \( \frac{1}{4πε_0} \)=9×109N-m2/C2)
[A] zero
[B] infinite
[C] 27 J
[D] 100 J
Questions No:12
A mass m = 20 g has a charge q = 3.0 mC. It moves with a velocity of 20 m/s and enters a region of electric field of n 80 N/c in the same direction as the velocity of the mass. The velocity of the mass after 3 s in this region is
[A] 80 m/s
[B] 56 m/s
[C] 44 m/s
[D] 40 m/s
Questions No:13
Four identical charges +50 µ C each are placed, one at each corner of a square of side 2 m. How much external energy is required to bring another charge of + 50 µ C from infinity to the centre of the square?
[A] 64 J
[B] 41 J
[C] 16 J
[D] 10 J
Questions No:14
Two equal charges q are placed at a distance of 2a and a third charge -2q is placed at the mid-point. The potential energy of the system is
[A] \( \frac{q^2}{8πε_0a } \)
[B] \( \frac{q^2}{8πε_0a } \)
[C] -\( \frac{7q^2}{8πε_0a } \)
[D] -\( \frac{9q^2}{8πε_0a } \)
Questions No:15
An alpha particle is accelerated through a potential difference of 106V. Its kinetic energy will be
[A] 1 MeV
[B] 2 MeV
[C] 4 MeV
[D] 8 MeV
Questions No:16
A charge of 5 C is given a displacement of 0.5 m. The work done in the process is 10 J. The potential difference between the two points will be
[A] 2V
[B] 0.25V
[C] 1 V
[D] 25 V
Questions No:17
How much kinetic energy will be gained by an ex-particle in going from a point at 70 V to another point at 50 V
[A] 40 eV
[B] 40 keV
[C] 40 MeV
[D] 0 eV
Questions No:18
The ratio of momenta of an electron and an α-particle which are accelerated from rest by a potential difference of 100 V is
[A] 1
[B] \( \sqrt\frac{2m_e}{m_α} \)
[C] \( \sqrt\frac{m_e}{m_α} \)
[D] \( \sqrt\frac{m_e}{2m_α} \)
Questions No:19
An electron enters in higher potential region V2 from lower potential region V1, then its velocity
[A] will increase
[B] will change in direction but not in magnitude
[C] will not change in direction of field
[D] will not change in direction perpendicular to field
Questions No:20
At a distance of 1 m from a fixed charge of 1 mC, a particle of mass 2 g and charge 1 µ C is held stationary. Both the charges are placed on a smooth horizontal surface. If the particle is made free to move, then its speed at a distance of 10 m from the fixed charge will be
[A] 10 ms q-1
[B] 20 ms-1
[C] 60 ms-1
[D] 90 ms-1
Electrostatics Mock Test-3
CategoriesNEET IIT Physics