Electronics and Communication Engineering
2019 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE ECE 2019 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 46–48 of 65. Imported answers require review unless explicitly marked reviewed.
Question 36
Open questionECMCQ2 marksNeeds review
Two identical copper wires W1 and W2, placed in parallel as shown in the figure, carry currents
and
, respectively, in opposite directions. If the two wires are separated by a distance of
, then the magnitude of the magnetic field
between the wires at a distance
from W1 is 
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 37
Open questionECMCQ2 marksNeeds review
The dispersion equation of a waveguide, which relates the wavenumber
to the frequency
, is
where the speed of light
m/s, and
is a constant. If the group velocity is
m/s, then the phase velocity isYour answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 38
Open questionECMCQ2 marksNeeds review
In the circuit shown, the breakdown voltage and the maximum current of the Zener diode are 20 V and 60 mA, respectively. The values of
and
are 200
and 1 k
, respectively. What is the range of
that will maintain the Zener diode in the ‘on’ state? 
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer