A. fluctuates off and on
B. varies in magnitude alone
C. changes its direction again and again
D. changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.
Related Mcqs:
- The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?
A. 1Hzs
B. 1.5Hzs
C. 106sec
D. 1sec - The leakage current in a silicon transistor is about_____________ the leakage current in a germanium transistor?
A. One hundredth
B. One tenth
C. One thousandth
D. One millionth - If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to___________________?
A. 6 mA
B. mA
C. 3 mA
D. 1 mA - Current produced by moving the loop of wire across a magnetic field is called_____________?
A. A.C current
B. D.C current
C. induced current
D. mean square current - Which of the following works on torque on the current carrying conductor placed in magnetic field ?
A. galvanometer
B. ammeter
C. voltmeter
D. all of the above - An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?
A. Induced current
B. Eddy current
C. Back emf
D. None of the above - The law that the induced e.m.f. and current always oppose the cause producing them is due to____________?
A. Faraday
B. Lenz
C. Newton
D. Coulomb - In case of an inductance, current is proportional to___________?
A. voltage across the inductance
B. magnetic field
C. both A. and B.
D. neither (A) nor (B) - Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla
A. 100 N
B. 400 N
C. 600 N
D. 1000 N - A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
A. variation in coil current
B. variation in voltage to the coil
C. change of number of turns of coil
D. the resistance of magnetic path
