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

Television frequencies are of the order of 100 MHz, while radio frequencies are of the order of 1 MHz. Using these as typical frequencies, the ratio of the emf generated in a loop antenna by a television wave to that generated by a radio wave, if both have equal electric field intensities.

A
1
B
10
C
100
D
66.6
2
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
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A coil of wire of a certain radius has 100 turns and a self inductance of 15 mH. The self inductance of a second similar coil of 500 turns will be

A
75 mH
B
375 mH
C
15 mH
D
None of the above
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10$$^{-5}$$ Wb. The inductance is

A
0.2 mH
B
2.0 mH
C
0.02 mH
D
None of these
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