Q.1
Electric field at a point varies as r0 for
  • An electric dipole
  • A point charge
  • A plane infinite sheet of charge
  • A line charge of infinite length
Q.2
The S.I. unit of electric flux is
  • Joule per coulomb
  • Newton per coulomb
  • Weber
  • Volt metre
Q.3
Linear charge density λ=qL\lambda=\frac{q}{L}λ=Lq​ is used for example in:
  • plates or surfaces
  • wires
  • spheres
  • All of above
Q.4
If the electric flux entering and leaving an enclosed surface respectively is ϕ1\phi_1ϕ and ϕ2\phi_2ϕ the electric charge inside the surface will be
  • (ϕ1+ϕ2)∈0\left(\phi_1+\phi_2\right)\in_0(ϕ1​+ϕ2​)∈0​
  • (ϕ1−ϕ2)∈0\left(\phi_1-\phi_2\right)\in_0(ϕ1​−ϕ2​)∈0​
  • (ϕ1+ϕ2)∈0\frac{\left(\phi_1+\phi_2\right)}{\in_0}∈0​(ϕ1​+ϕ2​)​
  • (ϕ1−ϕ2)∈0\frac{\left(\phi_1-\phi_2\right)}{\in_0}∈0​(ϕ1​−ϕ2​)​
Q.5
Two infinite plane parallel sheets separated by a distance 'd' have equal and opposite uniform charge densities σ\sigmaσ . Electric field at a point between the sheets is
  • Zero
  • σ2∈0\frac{\sigma}{2\in_0}2∈0​σ​
  • Depends upon the location of the point
  • σ∈0\frac{\sigma}{\in_0}∈0​σ​
Q.6
The intersection of field lines is due to
  • attraction
  • repulsion
  • it is not possible
  • both attraction and repulsion
Q.7
What quantity remains the same everywhere between two parallel plates?
  • Electric Field
  • Electric Potential
  • Electric Potential Energy
  • Speed
Q.8
How do electric field lines represent the magnitude of an electric field?
  • Length of the line
  • With arrows
  • Density of lines
  • Width of lines
Q.9
Fringing of field lines is due to
  • Uniform electric field
  • Non uniform electric field
  • Uniform charges on plates
  • Non uniform charges on plates
Q.10
Electric flux is maximum at angle
  • 45
  • 90
  • 180
  • 0
Q.11
If I triple the value of charge of a test charge the electric field will
  • Increase by 3
  • Increase by 9
  • Not change
  • Decrease by 9
Q.12
If the net flux through a gaussian surface is zero, the following four statements could be true. Which of the statements must be true?(a) There are no charges inside the surface. (b) The net charge inside thesurface is zero. (c) The electric field is zero everywhere on the surface.(d) The number of electric field lines entering the surface equals the number leaving the surface.
  • There are no charges inside the surface.
  • The net charge inside the surface is zero.
  • The electric field is zero everywhere on the surface.
  • The number of electric field lines entering the surface equals the number leaving the surface.
Q.13
Suppose a point charge is located at the center of a spherical surface. The electric field at the surface of the sphere and the total flux through the sphere are determined. Now the radius of the sphere is halved. What happens to the flux through the sphere and the magnitude of the electric field at the surface of the sphere?
  • The flux and field both increase.
  • The flux and field both decrease.
  • The flux increases, and the field decreases.
  • The flux decreases, and the field increases.
  • The flux remains the same, and the field increases.
Q.14
The dimensional formula of electric charge is
  • M0L0T1A1M^0L^0T^1A^1M0L0T1A1
  • M0L0T−1A1M^0L^0T^{-1}A^1M0L0T−1A1
  • M0L0T1A−1M^0L^0T^1A^{-1}M0L0T1A−1
  • M0L0T−1A−1M^0L^0T^{-1}A^{-1}M0L0T−1A−1
Q.15
Three charges, each of value Q, are placed at the vertex of an equilateral triangle. A fourth charge q is placed at the centre of the triangle. If the charges remains stationery then, q = ______
  • Q/√2Q/√2Q/√2
  • −Q/√3-Q/√3−Q/√3
  • −Q/√2-Q/√2−Q/√2
  • Q/√3Q/√3Q/√3
Q.16
Electric potential energy is measured in units of:
  • Joules
  • joules per coulomb, or volts.
  • ohms.
  • amperes.
Q.17
Since the electric field and the area are vectors, they have:
  • magnitude
  • direction
  • quantity
  • Both A & B
Q.18
“The total electric flux through any closed surface is equal to the total (net) electric charge enclosed by the surface, divided by e0”
  • Faraday's Law
  • Coulomb's Law
  • Gauss's Law
  • Volta'sLaw
Q.19
Who is attributed with the idea "An electric field is measurable effect generated by any charged object".
  • Faraday
  • Coulomb
  • Volta
  • Ampere
Q.20
When is the Electric Flux zero? (Check all that apply).
  • If inside the box there are equal magnitude charges with an opposite sign.
  • If the charges are outside the box.
  • If there are no charges inside the box.
  • All of above
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