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3.1 Electric Flux 1. Electric flux can be defined as, (a) The number of lines of force passing through any hypothetical surface placed in a field. (b) Is completely equivalent to the inverse square law for the electric field due to a point charge. (c) If the net charge within a spherical surface is zero, then the electric field is zero. (d) Non of the above 2. Total flux pass through a hypothetical surface is mathematically given by, (a) (b) (c) (d) Session 03 Questions

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3.1 Electric FluxElectric flux can be defined as,(a)The number of lines of force passing through any hypothetical surface placed in a field.(b) Is completely equivalent to the inverse square law for the electric field due to a point charge.(c) If the net charge within a spherical surface is zero, then the electric field is zero.(d)Non of the above

2.Total flux pass through a hypothetical surface is mathematically given by,(a) (b) (c) (d)

Session 03Questions

3.How do you take electric flux negative and positive?(a)If the electric field is directed inward from the surface, we take flux as positive.(b) If the electric field is directed outward from the surface, we take flux as positive.(c) If the electric field is directed inward from the surface, we take flux as negative.(d)Both b and c are correct.

4.The electric flux through a surface become zero,(a)When the electric field lines are perpendicular to the plane of the surface.(b)When the electric field lines are parallel to the plane of the surface.(c)When the electric field lines are incline to the plane of the surface.(d)Non of the above

5.What are the selection rules of a surface to calculate flux?6.Calculate total flux come out from charge q?3.2Gauss Theorem7.Gauss's law,(a)the total electric flux through a closed surface is always equal to the algebraic sum of charge enclosed within the surface divide by 0.(b)is completely equivalent to the inverse square law for the electric field due to a point charge.(c)implies that in static situations any excess charge on a conductor must lie on its surface.(d)is very useful for charge configurations with symmetry.8.Mathematical form of Gauss's law is,(a)(b)(c) (d)

9.What are the two Laws used to derive Gauss theorem?(a)Coulombs inverse law and Kirchhoffs law.(b) Kirchhoffs law and the principle of superposition.(c)Coulombs inverse law and the principle of superposition.(d) Kirchhoffs law and Lenz law.

3.3 Applications of Gauss Theorem10.What do you call Gaussian surface?(a)Cylinders and rectangular boxes.(b) Only spheres.(c)Spheres and cylinders.(d) Proper shape enclosing all the charges.

11.Gaussian surface should be,(a)selected, the electric field is of same magnitude over all the points of the surface.(b)normal to the electric field or parallel with it.(c)normal to the electric field or perpendicular with it.(d)both a and b are correct.

12.Write the two relations used to verify Coulombs Law(a)Gauss theorem and symmetry considerations.(b)Kirchhoffs law and the principle of superposition.(c)Kirchhoffs law and symmetry considerations.(d)Gauss theorem and Lenz law.13.What are the shapes taken as Gaussian surfaces?(a)Spheres, cylinders and rectangular boxes.(b)Spheres and cylinders.(c)Cylinders and rectangular boxes.(d)Only spheres.

3.3.2 The field of an Isolated Spherically Symmetric Charge Distribution14. Calculate the E outside the spherical charge distributionCalculate the E inside the spherical charge distribution.Calculate E inside and outside for hollow sphere of charge QPlot change of E with R for the two cases.

3.3.3 Field inside a conductor18.Calculate E on the surface of a conductor of charge density How do you protect from lightning surge?

3.3.4 Field due to an infinite line of charge20.What is the Gaussian surface use to calculate E of line charge?(a)Spherical (b) Cylindrical (c) Cubical (d) Rectangular

21.Find E at r distance from a line charge of per unit length22.Plot E against r for line charge

3.3.5 Field due to an infinite sheet of charge23.What are the Gaussian surfaces suitable to calculate E (a)Spherical (b) Cylindrical (c) Cubical (d) Rectangular

24.Find E and discuss change of E with distance

3.3.6 Field due to 2 parallel sheets of equal and opposite charge25.Why is the total E field outside is zero26.Calculate the E field inside when charge per unit area is 64.1 Work and Potential EnergyWhat is meant by potential energy?2.Give examples for potential energy?How does a body gain potential energy?Write an expression for work done.Express work done as vector productHow does the potential energy released?What are the deference potential of gravitational and electric fields? 4.2 Electric Potential EnergyWhat is the force acting on a charge q in an electric field E?Define conservative force?Write an expression for the potential energy difference4.3 Electric PotentialWhat is the difference between electric potential energy and the electric potential?Write an expression for electric potential.What is the SI unit for electric potential?Derive expression for potential difference due to point charge4.4 Absolute Electric PotentialHow do you define the absolute electric potential?Derive mathematical expression for absolute electric potentialWhat is the method to calculate electric potential when there are more than one electric potentials?Write an expression to calculate electric potential due to charge distribution?Calculate the electric potential due to a dipole.

4.5 Equipotential Surfaces in Electric FieldHow do you define equipotential surface?Write two characteristics of equipotential surfaces.Give one example for equipotential surface.

4.6 Conservative Nature of the Electric FieldWhat is meant by conservation of electric field?What will result in the expense of potential energy of a charge?What is the kinetic energy gain by charge q after travel under potential V? qV

4.7 Electric Potential and Field StrengthWrite expression for work done by electric field to move charge q by distance dlWrite expression for work done by charge q when travelling in potential VNow get the relation between potential difference and electric field1abdbaccddaa