1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5 A, then the average force on each electron in the coil due to the magnetic field is

A
$$2.5\times10^{-25}$$ N
B
$$4.5\times10^{-25}$$ N
C
$$5\times10^{-25}$$ N
D
$$5.5\times10^{-25}$$ N
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is $$\frac{2}{3}$$ of the weight?

A
$$\frac{2}{3}$$ g
B
g
C
$$\frac{1}{3}$$ g
D
zero
3
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

The string of length 2 m is fixed at both ends. If the string vibrates in its fourth normal mode with a frequency of 500 Hz, then the waves would travel on it with a velocity of

A
125 m/s
B
250 m/s
C
500 m/s
D
1000 m/s
4
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

An alternating voltage = 200 $$\sin 100t$$ is applied to a series combination of $$R=30\Omega$$ and an inductor of 400 mH. The power factor of the circuit is,

A
0.01
B
0.6
C
0.05
D
0.042
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