1
TG EAPCET 2025 (Online) 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

At a certain place in the magnetic meridian the Earth's magnetic field is twice its vertical component. The ratio of horizontal component of Earth's magnetic field and the total magnetic field of the Earth at the place is

A

$\sqrt{3}: 2$

B

$1: 2$

C

$1: \sqrt{3}$

D

$1: 3$

2
TG EAPCET 2025 (Online) 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A coil of resistance $16 \Omega$ is placed with its plane perpendicular to a uniform magnetic field whose flux ( $\phi$ in $10^{-3}$ weber) changes with time ( $t$ in second) as $\phi=5 t^2+4 t+2$. The induced current at time $t=6$ second is

A

4 mA

B

2.12 mA

C

34 mA

D

74 mA

3
TG EAPCET 2025 (Online) 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The small energy losses in transformers due to eddy currents can be reduced by

A

winding the primary and secondary coils one over the other.

B

using thick wire.

C

using a laminated core.

D

using magnetic material with low hysteresis loss.

4
TG EAPCET 2025 (Online) 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the electric field of a plane electromagnetic wave is $E_z=60 \sin \left(0.5 \times 10^3 x+1.5 \times 10^{11} t\right) \mathrm{Vm}^{-1}$, then the magnetic field of the wave is

A

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

B

$B_z=2 \times 10^{-7} \sin \left(0.5 \times 10^3 x+15 \times 10^{11} t\right) T$

C

$B_x=180 \times 10^8 \sin \left(0.5 \times 10^3 x+1.5 \times 10^{11} t\right) T$

D

$B_y=180 \times 10^8 \sin \left(0.5 \times 10^3 x+1.5 \times 10^{11} t\right) \top$

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