1
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

2
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.

3
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

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

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

In a photoelectric experiment, the slope of the graph drawn between stopping potential along $Y$-axis and frequency of incident radiation along $X$-axis is (Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$ )

A

$2.42 \times 10^{15} \mathrm{JsC}^{-1}$

B

$10.56 \times 10^{-15} \mathrm{JsC}^{-1}$

C

$4.125 \times 10^{-15} \mathrm{JsC}^{-1}$

D

$6.25 \times 10^{-20} \mathrm{JsC}^{-1}$

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