ELECTROMAGNETIC FIELD THEORY QUIZ

A rectangular loop in the x – z plane bounded by the lines x = 0, x = a, z = 0 and z = b is in a time varying magnetic field is given by B = B0 cosωt + ay. Where B0 is constant, ω is angular frequency and ay unit vector in the y direction. Now the emf induced in the loop is given by

ab Bo cosω t.

Zero.

abω Bo sinω t.

Bo ω sinω t.

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The main disadvantage of the two-hole directional coupler is

High standing wave ratio

Low directional coupling

Poor directivity

Narrow bandwidth

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Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V.

0.5m.

5.25m.

6.25m.

0.6m.

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A pure inductor when connected across 220 V, 50 Hz supply consumes 100 W. From the above statement it can be concluded that

the inductor has ferrite core.

the inductor is non linear.

the above statement is false.

the inductor is made of thin wire.

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If a and b are the dimensions of waveguide then

a = b

a = b/4

a = 3b

a = 2b

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A square corner reflector is used in which of the following?

All of these

TV broadcast

Point-to-point communication

Radio astronomy

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Tropospheric scatter propagation is not subject to any fading.

True

False

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The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

5 mH.

10 mH.

0 mH.

20 mH.

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A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

A = cosφ Ir - sinφ Ir.

A = cosφ Ir.

A = sinφ Ir.

A = cosφ Ir + sinφ Iφ.

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Which statement does not say that electrostatic field is conservative?

The work done in a closed path inside the fields is zero.

If the curl of E is identically zero.

If is gradient of a scalar potential.

The potential difference between two points is zero.

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