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Applied Physics 2: Electrodynamics
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Applied Physics 2: Electrodynamics
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25 Questions

1. Dipole moments are used to calculate the
2. When the rotational path of the magnetic field intensity is zero, then the current in the path will be
3. Find the force between two charges when they are brought in contact and separated by 4cm apart, charges are 2nC and -1nC, in μN.
4. The potential due to a dipole at a point P from it is the
5. The correct sequence to find H, when D is given is
6. Find the magnetic field intensity when the current density is 0.5 units for an area up to 20 units.
7. The total current density is given as 0.5i + j – 1.5k units. Find the curl of the magnetic field intensity.
8. Calculate the emf when the flux is given by 3sin t + 5cos t
9. The Gaussian surface for a point charge will be
10. Two small diameter 10gm dielectric balls can slide freely on a vertical channel. Each carry a negative charge of 1μC. Find the separation between the balls if the lower ball is restrained from moving.
11. At dc field, the displacement current density will be
12. The potential of a coaxial cylinder with charge density 1 unit , inner radius 1m and outer cylinder 2m is (in 109)
13. Calculate the emf of a material having flux density 5sin t in an area of 0.5 units.
14. Dipoles in any electric field undergo
15. Find the conduction current density of a material with conductivity 200units and electric field 1.5 units.
16. Gauss law for magnetic fields is given by
17. Gauss law cannot be used to find which of the following quantity?
18. Find the curl of E when B is given as 15t.
19. A circular disc of radius 5m with a surface charge density ρs = 10sinφ is enclosed by surface. What is the net flux crossing the surface?
20. To find D from B, sequence followed will be
21. The gradient of the magnetic vector potential can be expressed as
22. Find the potential due the dipole when the angle subtended by the two charges at the point P is perpendicular.
23. Calculate the conduction density of a material with resistivity of 0.02 units and electric intensity of 12 units.
24. An implication of the continuity equation of conductors is given by
25. For two charges 3C and -3C separated by 1cm and are located at distances 5cm and 7cm respectively from the point P, then the distance between their midpoint and the point P will be

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