An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?

Related Mcqs:

1. What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?

   A. 0.5 mH
   B. 0.5H
   C. 2.0H
   D. 8.0H

2. The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________?

   A. Average current
   B. Sinusoidal current
   C. r.m.s current
   D. Net current

3. If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be_______________?

   A. 3600C
   B. 7200C
   C. 1C
   D. 2C

4. How many electrons per second constitute a current of one micro ampere?

   A. one electron
   B. 10 ^–6 electrons
   C. 10⁶ electrons
   D. 6.25 × 10¹² electrons

   Submitted by: Tauseef Ali

5. An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ?

   A. 10mH
   B. 12mH
   C. 16mH
   D. 20mH

6. The back emf of a motor which is just started is_________?

   A. Zero
   B. Maximum
   C. Minimum
   D. Optimum

   Submitted by: Raza Baloch

7. A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?

   A. (R+2πfL)
   B. R+1/2πfL
   C. (R2+f2L2)
   D. (R2+4π2f2L2)

8. When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?

   A. Same
   B. Different
   C. At L will be more than at C
   D. At L will be less than at C

9. At Murree Hills (Assume the value of g changes). If we use a simple pendulum as time standard then one-second duration will_____________?

   A. Increase
   B. Decrease
   C. Remains the same
   D. Is zero

10. The most suitable unit for expressing nuclear radius is_______?

    A. Angstrom
    B. Micro
    C. Nano meter
    D. Fermi

    Submitted by: Malik Asghar Hussain