Electromagnetism MCQs
Practice free Electromagnetism multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 221 questions — no login required.
Question 100easy
A short grounded vertical antenna has a length / which is 0.05 at frequency f. If its radiation resistance at f is R ohms, then its radiation resistance at a frequency 2f will be
Question 101easy
Two isotropic radiators A and B are placed along the X-axis at the positions (-2t,/8, 0) and (+2t,/8, 0) respectively. The elements are fed by currents of equal amplitude with the phase of B leading that of A by 900? The array pattern will have maxima
Question 102easy
If a vertical dipole antenna is used in conjunction with a loop antenna for direction finding, then the field pattern obtained will be
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Question 103easy
A transmission line whose charactersistic is a resistance
Question 104easy
A loss less transmission line having 501 characteristic impedance and length A14 is short circuited at one end and connected to an ideal voltage source of IV at the other end. The current drawn from the voltage source is
Question 105easy
The time averaged pointing vector, in co/m2, for a wave with E = 24eR0)t+li7). j in free space is-2.4 _
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Question 106easy
The depth of penetration of wave in a lossy dielectric increases with increasing
Question 107easy
The palarisation of wave with electric field vector E. = Eoewot [3z) (ix + y is
Question 108easy
The dominant mode in a rectangular wave guide is TE0, because this mode has