1
VITEEE 2024
MCQ (Single Correct Answer)
+1
-0

The magnetic field in a electromagnetic wave is given by

$$B_y=2 \times 10^{-7} \sin \left(0.5+10^3 x+1.5 \times 10^{11} t\right) \mathrm{T}$$

The frequency of the wave is (in GHz)

A
1.26 GHz
B
2.39 GHz
C
12.6 GHz
D
23.9 GHz
2
VITEEE 2024
MCQ (Single Correct Answer)
+1
-0

An electromagnetic wave with poynting vector $6 \mathrm{Wm}^{-2}$ is absorbed by a surface area $12 \mathrm{~m}^2$. The force on the surface is

A
$24 \times 10^{-8} \mathrm{~N}$
B
$30 \times 10^{-5} \mathrm{M}$
C
$2.4 \times 10^{-12} \mathrm{~N}$
D
$3.6 \times 10^8 \mathrm{M}$
3
VITEEE 2024
MCQ (Single Correct Answer)
+1
-0

Two point charges of $+3 \mu \mathrm{C}$ and $-3 \mu \mathrm{C}$ are placed at a certain distance apart from each other. Electric potential at a distance 60 cm from the mid-point of dipole on axial line is 150 V , then the value of dipole length is

A
$2 \times 10^{-3} \mathrm{~m}$
B
$2 \times 10^{-4} \mathrm{~m}$
C
$10^{-3} \mathrm{~m}$
D
$10^{-4} \mathrm{~m}$
4
VITEEE 2024
MCQ (Single Correct Answer)
+1
-0

The primary of a transformer has 400 turns while the secondary has 2000 turns. If the power output from the secondary at 1000 V is 12 kW . The resistance of the primary is $0.2 \Omega$ and that of the secondary is $2 \Omega$. If the efficiency of the transformer is $80 \%$, then the power loss in the primary is

A
288 W
B
1125 W
C
2000 W
D
725 W
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