JEE Questions for Physics Electrostatics I Quiz 19 - MCQExams.com


Physics-Electrostatics I-72057.png
  • Is zero
  • Depends upon E

  • Physics-Electrostatics I-72058.png
  • Depends upon the atomic number of the conducting element

Physics-Electrostatics I-72059.png
  • Zero
  • Infinite
  • 27 J
  • 100 J
There is an electric field E in X-direction. If the work done moving a charge 0.2C through a distance of 2 m along a line making an angle 60° with the X-axis is 4.0,what is the value of E?

  • Physics-Electrostatics I-72061.png
  • 2)
    Physics-Electrostatics I-72062.png

  • Physics-Electrostatics I-72063.png
  • None of these
Four equal charges Q are placed at the four corners of a square of each side is \'a\'. Work done in removing acharge –Q from its centre to infinity is
  • 0
  • 2)
    Physics-Electrostatics I-72065.png

  • Physics-Electrostatics I-72066.png

  • Physics-Electrostatics I-72067.png

Physics-Electrostatics I-72069.png
  • Zero
  • E

  • Physics-Electrostatics I-72070.png

  • Physics-Electrostatics I-72071.png
Below figures (and (represent lines of force. Which is correct statement
Physics-Electrostatics I-72072.png
  • Figure (represents magnetic lines of force
  • Figure (represents magnetic lines of force
  • Figure (represents electric lines of force
  • Both figure (and figure (represent magnetic lines of force
At a certain distance form a point charge the electric field is 500 V/m and the potential is 3000 V. What is this distance?
  • 6 m
  • 12 m
  • 36 m
  • 144 m
A metallic solid sphere is placed in a uniform electric field. The lines of force follow the path (s) shown in figure as
Physics-Electrostatics I-72075.png
  • 1
  • 2
  • 3
  • 4

Physics-Electrostatics I-72347.png
  • E is necessarily zero on the surface
  • E is perpendicular to the surface at every point
  • The total flux through the surface is zero
  • The flux isn only going out of the surface
The distance between a proton and electron both having a charge 1.6 × 10–19 of a hydrogen atom is 10–10metre The value of intensity of electric field produced on electron due to proton will be
  • 2.304 × 10–10 N/C
  • 14.4 V/m
  • 16 V/m
  • 144 × 1011N/C
What is the magnitude of a point charge due to which the electric field 30 cm away has the magnitude 2 newton/coulomb [1 / 4πɛ0 = 9 × 109Nm2/ C2]?
  • 2 × 10–11 coulomb
  • 3 × 10–11 coulomb
  • 5 × 10–11 coulomb
  • 9 × 10–11 coulomb

Physics-Electrostatics I-72078.png
  • E along KO
  • 3E along OK
  • 3E along KO
  • E along OK
In Millikan\'s oil drop experiment an oil drop carrying a charge Q is held stationary by a potential difference 2400 V between the plates. To keep a drop of half the radius between the plates. To keep a drop of half the radius stationary the potential difference had to be made 600V
What is the charge on the second drop?

  • Physics-Electrostatics I-72079.png
  • 2)
    Physics-Electrostatics I-72080.png
  • Q

  • Physics-Electrostatics I-72081.png
A charge of 5C experience 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?
  • 10 V
  • 250 V
  • 1000 V
  • 2500 V
Equal charges q are placed at the vertices A and B of an equilateral triangle ABC of side a. The magnitude ofelectric field at the point C is

  • Physics-Electrostatics I-72085.png
  • 2)
    Physics-Electrostatics I-72086.png

  • Physics-Electrostatics I-72087.png

  • Physics-Electrostatics I-72088.png

Physics-Electrostatics I-72095.png

  • Physics-Electrostatics I-72096.png
  • 2)
    Physics-Electrostatics I-72097.png

  • Physics-Electrostatics I-72098.png

  • Physics-Electrostatics I-72099.png
The electric potential at a point in free space due to a charge Q coulomb is Q × 1011volts. The electric field atthe point is

  • Physics-Electrostatics I-72101.png
  • 2)
    Physics-Electrostatics I-72102.png

  • Physics-Electrostatics I-72103.png

  • Physics-Electrostatics I-72104.png
The figure shows some of the electric field lines corresponding to an electric fields. The figure suggests
Physics-Electrostatics I-72108.png
  • EA> EB> EC
  • EA = EB= EC
  • EA = EC> EB
  • EA = EC< EB
Two spheres of radii a andb respectively are charged and joined by a wire. The ration of electric field of thespheres is

  • Physics-Electrostatics I-72109.png
  • 2)
    Physics-Electrostatics I-72110.png

  • Physics-Electrostatics I-72111.png

  • Physics-Electrostatics I-72112.png
A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is

  • Physics-Electrostatics I-72114.png
  • 2)
    Physics-Electrostatics I-72115.png

  • Physics-Electrostatics I-72116.png

  • Physics-Electrostatics I-72117.png
A hollow insulated conducting sphere is given a positive charge of 10 µC. What will be the electric field at the centre of the sphere if its radius is 2 m?
  • Zero
  • 5g cm–2
  • 20g cm–2
  • 8g cm–2
An electron of mass me initially at rest moves through a certain distance in a uniform electric field in time t1. A proton of mass mp also initially at rest takes time t2 to move thorough an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio of t2 / t1 is nearly equal to
  • 1
  • (mp/me)1/2
  • (me/mp)1/2
  • 1836
A cube of side b has a charge q at each of its vertices. The electric field due to this charge distribution at the centre of this cube will be
  • q / b2
  • q / 2b2
  • 32q / b2
  • 1610 N / C
Four charges are placed on corners of a square as shown in figure having side of 5 cm If Q is one microcoulomb, then electric field intensity at centre will be
Physics-Electrostatics I-72120.png
  • 1.02 × 107 N/C upwards
  • 2.04 × 107 N/C downwards
  • 2.04 × 107 N/C upwards
  • 1.02 × 107 N/C downwards
Point charge +4q, –q and +4q are kept on the x-axis at points x = 0, x = a and x = 2a respectively, then
  • Only q is in stable equilibrium
  • None of the charges are in equilibrium
  • All the charges are in unstable equilibrium
  • All the charges are is stable equilibrium
What is the potential energy of the equal positive point charges of 1µC each held lm apart in air?
  • 9 × 10–3 J
  • 9 × 10–3 eV
  • 2 eV/m
  • Zero
An oil drop having charge 2e is kept stationary between two parallel horizontal plates 2.0 cm apart when a potential difference of 12000 volts is applied between them. If the density of oil is 900 kg/m3 , the radius of drop will be
  • 2.0 × 10–6 m
  • 1.7 × 10–6 m
  • 1.4 × 10–6 m
  • 1.1 × 10–6 m
The ratio of moment of an electron and α–which are accelerated from rest by a potential difference of 100 volt is
  • 1
  • 2)
    Physics-Electrostatics I-72132.png

  • Physics-Electrostatics I-72133.png

  • Physics-Electrostatics I-72134.png
An electron enters between two horizontal plats separated by 2 mm and having a potential difference of 1000 V. The force on electron is
  • 8 × 10–12 N
  • 8 × 10–14 N
  • 8 × 109 N
  • 8 × 1014 N

Physics-Electrostatics I-72142.png
  • 2.5 micro-coulomb
  • 2.0 micro-coulomb
  • 1.0 micro- coulomb
  • 0.5 micro-coulomb

Physics-Electrostatics I-72144.png
  • 9 × 104 V
  • 18 × 104 V
  • 36 × 104 V
  • 36 × 10–4 V
Electric field strength due to a point charge of 5µC at a distance of 80cm from the charge is
  • 8 × 104 N/C
  • 7 × 104 N/C
  • 5 × 104 N/C
  • 4 × 104 N/C
Three identical point charges, as shown are placed at the vertices of an isosceles right angled triangle. Which of the numbered vectors coincides in direction with the electric field at the mid-point M of the hypotenuse?
Physics-Electrostatics I-72148.png
  • 1
  • 2
  • 3
  • 4
There is a solid sphere of radius ‘R\' having uniformly distributed charge. What is the relation between electric field \'E\' (inside the sphere) and radius of sphere‘R\' is

  • Physics-Electrostatics I-72150.png
  • 2)
    Physics-Electrostatics I-72151.png

  • Physics-Electrostatics I-72152.png

  • Physics-Electrostatics I-72153.png
Which of the following is deflected by electric field?
  • X-rays
  • γ–rays
  • Neutrons
  • α–particles
Charges 4Q, q andA placed along x-axis at positionsx = 0, x =1/2 and x = 1, respectively. Find the value of qso that force on charge Q is zero
  • Q
  • Q/2
  • –Q/2
  • –Q
A charged particle of mass 5 × 10–5 kg is held stationary in space by placing it in an electric field of strength 107NC–1 directed vertically downwards. The charge on the particle is
  • –20 × 10–5 µC
  • –5 × 10–5 µC
  • 5 × 10–5 µC
  • 20 × 10–5 µC
Two electric charges 12 µC and –6 µC are placed 20 cm apart in air. There will be a point P on the line joining these charges and outside the region between them, at which the electric potential is zero. The distance of P from –6 µC charge is
  • 0.10 m
  • 0.15 m
  • 0.20 m
  • 0.25 m
In the given figure distance of the point from A wherethe electric field is zero is
Physics-Electrostatics I-72158.png
  • 20 cm
  • 10 cm
  • 33 cm
  • None of these
Figures below show regular hexagons, with charges at the vertices. In which of the following cases the electric field at the centre is not zero?
Physics-Electrostatics I-72160.png
  • 1
  • 2
  • 3
  • 4
An electron enters in an electric field with its velocity in the direction of the electric lines of force. Then
  • The path of the electron will be a circle
  • The path of the electron will be a parabola
  • The velocity of the electron will decrease
  • The velocity of the electron will increase
An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. The final speed of the electron will be

  • Physics-Electrostatics I-72162.png
  • 2)
    Physics-Electrostatics I-72163.png

  • Physics-Electrostatics I-72164.png

  • Physics-Electrostatics I-72165.png
The dimension of (1/ɛ0E2(ɛ0 : permittivity of free space; E: electric field) is
  • MLT–1
  • ML2T–2
  • ML–1T–2
  • ML2T–1
In the rectangle, shown below, the two corners have charges q1 = –5 µC and q2 = +2.0 µC. The work done in moving a charge +3.0 µC from B to A is (take1/4πɛ0 =1010 N–m2/ C2)
Physics-Electrostatics I-72168.png
  • 2.8J
  • 3.5 J
  • 4.5 J
  • 5.5 J
If q is the charge per unit area on the surface of a conductor, then the electric field intensity at a point on the surface is

  • Physics-Electrostatics I-72170.png
  • 2)
    Physics-Electrostatics I-72171.png

  • Physics-Electrostatics I-72172.png

  • Physics-Electrostatics I-72173.png
A hollow conducting sphere of radius R has a charge (+Q) on its surface. What is the electric potential within the sphere at a distance r = R/3 from its centre?
  • Zero
  • 2)
    Physics-Electrostatics I-72174.png

  • Physics-Electrostatics I-72175.png

  • Physics-Electrostatics I-72176.png
Two spheres A and B of radius \'a\' and `b\' at same electric potential. The ratio charge densities of A and B is

  • Physics-Electrostatics I-72177.png
  • 2)
    Physics-Electrostatics I-72178.png

  • Physics-Electrostatics I-72179.png

  • Physics-Electrostatics I-72180.png
Electric field intensity at a point in between two parallel sheets with like charges of same surface charge densities (σ) is

  • Physics-Electrostatics I-72182.png
  • 2)
    Physics-Electrostatics I-72183.png
  • Zero

  • Physics-Electrostatics I-72184.png
In an hydrogen atom, the electron revolves around the nucleus in an orbit of radius 0.53 × 10–10 m. Then theelectrical potential produced by the nucleus at theposition of the electron is
  • –13.6 V
  • –27.2 V
  • 27.2 V
  • 13.6 V
Three identical charges each of 2µC are placed at the vertices of a triangle ABC as shown in the figure
If AB + AC = 12 cm and AB. AC = 32 cm2, the potential energy of the charge at A is
  • 1.53 J
  • 5.31 J
  • 3.15 J
  • 1.35 J
0:0:1


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