1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

An electromagnetic wave of frequency $$3 \mathrm{~MHz}$$ passes from vacuum into a dielectric medium $$(\mu_r=1)$$ of relative permittivity 4.0. Then,

A
Wavelength is halved and frequency is doubled
B
Wavelength doubled and frequency remains unchanged
C
Wavelength and frequency are unchanged
D
Wavelength is halved and frequency remains unchanged
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A group of devices having a total power rating of 500 watt is supplied by an $$\mathrm{AC}$$ voltage $$E=200 \sin \left(3.14 t+\frac{\pi}{4}\right)$$. Then the r.m.s. value of the circuit current is

A
500 A
B
1 A
C
200 A
D
5 A
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { In a p-n junction, the depletion layer of thickness } 1 \mu \mathrm{m} \text { has } 0.05 \mathrm{~V} \text { potential across it. The electric field in } N C^{-1} \text { is } $$

A
$$ 5 \times 10^{-8} $$
B
$$ 5 \times 10^{2} $$
C
$$ 5 \times 10^{5} $$
D
$$ 5 \times 10^{4} $$
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A long horizontal wire $$\mathrm{P}$$ carries current of $$50 \mathrm{~A}$$ from left to right. It is rigidly fixed. Another fine wire $$\mathrm{Q}$$ is placed directly above and parallel to $$\mathrm{P}$$. The mass of the wire is '$$\mathrm{m}$$' $$\mathrm{kg}$$ and carries a current of '$$\mathrm{I}$$' A. The direction of current in $$\mathrm{Q}$$ and position of wire $$\mathrm{Q}$$ from $$\mathrm{P}$$ so that the wire $$\mathrm{Q}$$ remains suspended are

A
$$ \text { Right to left, } \quad \frac{50 I \mu_0}{\pi m g} $$
B
$$ \text { Left to right, } \quad \frac{25 I \mu_0}{\pi m g} $$
C
$$ \text { Right to left, } \quad \frac{25 I \mu_0}{\pi m g} $$
D
$$ \text { Right to left, } \quad \frac{I \mu_0}{4 \pi m g} $$
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