When a wire loop is rotated in two poles of magnetic field, the direction of e.m.f. change once in every:
Correct answer: D. 1/2 revolution
- A. 1 revolution
- B. 2 revolution
- C. 1/4 revolution
- D. 1/2 revolution
Explanation
For 1st half rotation induced EMF in a wire loop present in a magnetic field is given as a sinusoidal function. E=Eosin(ωt) The sinusoidal function has two sign changes in one cycle. Therefore, in every half of its revolution, the direction of the EMF induced will change.For 1st half rotation, emf in sinusoidal wave above the mean line and for 2nd half rotation below the mean line.
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Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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