A. ωB/r22-r12/Δt
B. ωB(r2-r1)2/Δt
C. ωB(r22-r12)/Δt
D. ωB(r22+r12)/Δt
0
Self-inductance of a long solenoid is______________?
0
The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?
A. μoN2A
B. μoN2/A
C. μoN2
D. BA
0
Self inductance of a coil depends upon________________?
A. 1Hzs
B. 1.5Hzs
C. 106sec
D. 1sec
0
Energy stored in a magnetic field is given by______________?
A. current flowing
B. number of turns per unit length
C. voltage produce
D. all
0
For electroplating we use_________________?
A. LI2
B. L2I/2
C. LI2/2
D. IL2
0
The only difference between construction of D.C generator and A.C generator is that of_______________?
A. A D.C source
B. an A.C source
C. any source
D. all of the above
0
If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?
A. carbon brushes
B. coil
C. commutator
D. magnetic field
0
A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?
A. Vs/Vp = Np/Ns
B. Vs/Vp = Ns/Np
C. Vp/Vs = Ns/Np
D. Vp/Vs = Np/Ns