1
GATE ECE 1995
MCQ (Single Correct Answer)
+1
-0.3
Copper behaves as a
A
conductor always.
B
conductor or dielectric depending on the applied electric field strength.
C
conductor or dielectric depending on the frequency.
D
conductor or dielectric depending on the electric current density.
2
GATE ECE 1995
MCQ (Single Correct Answer)
+1
-0.3
The electric field strength at a distance point, P, due to a point charge, +q, located at the origin, is 100 $$\mu $$V/m. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose center is at the origin, then the electric field strength at the point P outside the sphere becomes.
A
Zero
B
100 $$\mu $$V/m
C
-100 $$\mu $$V/m
D
50 $$\mu $$V/m
3
GATE ECE 1995
MCQ (Single Correct Answer)
+1
-0.3
In the infinite plane, y = 6 m, there exists a uniform surface charge density of (1/6000$$\pi $$) $$\mu $$C/m2. The associated electric field strength is:
A
$$30\,\widehat i\,$$ V/m
B
$$3\,\widehat j\,$$ V/m
C
$$30\,\widehat k\,$$ V/m
D
$$60\,\widehat j\,$$ V/m
4
GATE ECE 1995
Subjective
+5
-0
A rectangular hollow metal waveguide is required to be so designed to propagate a 9375 MHz signal in its $$T{E_{10}}$$-mode that the guide-wavelength equals the cut-off wavelength. Calculate the value of 'a' (breadth or the wider dimension of the waveguide). Take b = a/2. Also, calculate the cut-off frequency of the next higher order mode.
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