13. (5%) The instantaneous expression for the electric field of a uniform plane wave in vacuum is given by .We denote the intrinsic impedance of the free space by no. The magnetic field is (A)(B)(C) (D) None of the above.

1. (5%) A cylindrical capacitor consists of an inner conductor of radius a, and an outer conductor whose inner radius is b. The space between the conductors is filled with a dielectric of permittivity ε. The length of the capacitor is L. The capacitance of this this capacitor is (A) C=2πεL/ln(b/a) (B) C=2πεL/In(a/b)(C)C=2πεL/In(ab) (D) none of the mentioned

13. (5%) The instantaneous expression for the electric field of a uniform plane wave in vacuum is given by .We denote the intrinsic impedance of the free space by no. The magnetic field is
(A)
(B)
(C)
(D) None of the above.

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