1
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A solenoid of length $$60 \mathrm{~cm}$$ with 15 turns per $$\mathrm{cm}$$ and area of cross-section $$4 \times 10^{-3} \mathrm{~m}^2$$ completely surrounds another co-axial solenoid of same length and area of cross-section $$2 \times 10^{-3} \mathrm{~m}^2$$ with 40 turns per $$\mathrm{cm}$$. Mutual inductance of the system is

A
9 mH
B
6 mH
C
3 mH
D
10 mH
2
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A bulb of resistance $$280 \Omega$$ is supplied with a 200 V AC supply. What is the peak current?

A
Nearly $$1 \mathrm{~A}$$
B
Nearly $$2 \mathrm{~A}$$
C
Nearly $$1.4 \mathrm{~A}$$
D
Nearly $$2.8 \mathrm{~A}$$
3
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic field of a plane electromagnetic wave is given by $$B=(400 \propto \mathrm{T})\sin \left[\left(4.0 \times 10^{15} \mathrm{~s}^{-1}\right)\left(t-\frac{x}{c}\right)\right]$$. Average energy density corresponding to the electric field is

A
$$8 \times 10^{-3} \mathrm{Jm}^{-3}$$
B
$$31.8 \times 10^{-3} \mathrm{Jm}^{-3}$$
C
$$80 \times 10^{-3} \mathrm{Jm}^{-3}$$
D
$$3.18 \times 10^{-3} \mathrm{Jm}^{-3}$$
4
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The de-Broglie wavelength associated with a proton under the influence of an electric potential of 100 V is

A
1.227 $$\mathop A\limits^o $$
B
2.86 pm
C
12.27 $$\mathop A\limits^o $$
D
1.146 $$\times$$ 10$$^{-21}$$ m
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