7. In calculation of capacitance we dealt with an \"ideal\" capacitor, which is

Question

7. In calculation of capacitance we dealt with an "ideal" capacitor, which is defined as a capacitor a) with zero resistance b) charge polarization effects are neglected neglected c) (existence of E-field on edges) effects are d) none of the above e) both a) and c) is true or a current loop with a magnetic dipole moment, m in air, the following a) the orientation of Band field lines produced by the dipole is similar force experienced by the loop in a constant B-field is zero c) in the presence of B-field there will be always a torque acting on the a d) none above loop both a) and b) 9. For a ferromagnetic material the following would not be true a) its magnetization is associated with orbital molecular currents b) energy gained in 2 cycles is twice the area of a hysteresis loop c) its permeability is always equal to that of another ferromagnetic material e) both a) and c) 10. Consider a infinite cylindrical wire with radius ro carrying current lo assuming that current density is constant, the strength of magnetic field produced by the wire is to a) increase linearly with r for r ro none of the above 11. A plane EM-wave travels in a free space along x-direction. The H-vector associated with the wave is most likely given by the following equation a) Ar 0.1 cos(020t-133z) i c) cos (10er-133x) e) A 10cos (10" t -133y) 12. A proton of a constant velocity ie -uri+u, +u enters a region of a constant magnetic field, Bei The trajectory of the proton in the region will be a) straight line b) circle c) d) sinusoid e) parabola none of the above

Explanation / Answer

7) e

8) a

9) a

10) a

11) e

12) b

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