Electromagnetic Field Theory - Study Mode
[#96] In a uniform plane wave 'E' and 'H' are related by
Correct Answer
(C) $$frac{{overrightarrow E }}{{overrightarrow H }} = sqrt {frac{mu }{varepsilon }} $$
[#97] In a coaxial transmission line (ε r = 1), the electric field intensity is given by: $$E = frac{{100}}{
ho }cos left( {{{10}^9}t - 6z}
ight){u_p}{ ext{V/m}}$$ The displacement current density is
Correct Answer
(C) $$ - frac{{0.9}}{
ho }sin left( {{{10}^9}t - 6z}
ight){u_p}{ ext{A/}}{{ ext{m}}^2}$$
[#98] The torque (in N - m) acting on a circular current loop of radius 1 mm in the xy-plane, connected at the origin and with current 0.1 A flowing in the sense of increasing φ in a magnetic field $$B = {10^{ - 5}}left( {2{{hat a}_x} - 2{{hat a}_y} + {{hat a}_z}}
ight){ ext{Wb/}}{{ ext{m}}^2}{ ext{ is:}}$$
Correct Answer
(B) $$2 imes {10^{ - 12}}pi left( {{{hat a}_y} + {{hat a}_x}}
ight)$$
[#99] When a line short circuited at far end, the minimum voltage occurs at
Correct Answer
(A) Far end
[#100] A 3 µF capacitor is charged by a constant current of 2 µA for 6 seconds. The voltage across the capacitor to the end of charging will be:
Correct Answer
(B) 4 V