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  • Question
  • If e is the charge of an electron, R is the radius of its orbit and ? is the angular velocity of electron, the magnetic dipole moment ?m of the orbit is |?m| = e?R2.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    Explanation
    1 ?m 1 = 0.5 e?r2.

    More questions

    • 1. The IF stage of a receiver employs

    • Options
    • A. capacitive coupling
    • B. impedance coupling
    • C. double-tuned transformer coupling
    • D. single-tuned transformer coupling
    • Discuss
    • 2. A TV picture is to be transmitted over a channel of 6 MHz bandwidth at a 35 dB S/N ratio. The capacity of the channel is

    • Options
    • A. 50 Mbps
    • B. 100 Mbps
    • C. 36 Mbps
    • D. 72 Mbps
    • Discuss
    • 3. The amount of dielectric heating is inversely proportional to frequency.

    • Options
    • A. True
    • B. False
    • Discuss
    • 4. During transmission over a communicate channel, bit errors occur independently with probability . If a block of 3 bits are transmitted, the probability of at most one bit error is equal to

    • Options
    • A.
    • B.
    • C.
    • D. none
    • Discuss
    • 5. A plane wave is characterized by the wave is

    • Options
    • A. linearly polarized
    • B. circularly polarized
    • C. elliptically polarized
    • D. unpolarized
    • Discuss
    • 6. A capacitor C farads is charged to a voltage V. It discharges through a thyristor, a diode and an inductance L. The peak current in the circuit is

    • Options
    • A. VCL
    • B.
    • C.
    • D.
    • Discuss
    • 7. In a semi converter feeding a resistive load,

    • Options
    • A. the waveshapes of input voltage and input current are always similar
    • B. the waveshapes of input voltage and input current can never be similar
    • C. the waveshapes of input voltage and input current are similar only if firing angle is zero
    • D. the waveshapes of input voltage and input current are similar only if firing angle is high
    • Discuss
    • 8. A single phase converter is fed by a source having an inductance L. If load current is I0, the decrease in output voltage due to overlap is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 9. A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque

    • Options
    • A. will be less than 100 N-m
    • B. will be more than 100 N-m
    • C. may be more or less than 100 N-m depending on motor parameters
    • D. very small
    • Discuss
    • 10. The phenomenon of overlap in converter operation due to

    • Options
    • A. source resistance
    • B. source inductance
    • C. both source resistance and source inductance
    • D. high value of firing angle
    • Discuss


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