The direction of induced current is always so as to oppose the change which causes the current. This is:
Correct answer: B. Lenz's Law
- A. Faraday's Law
- B. Lenz's Law
- C. Ohm's Law
- D. Kirchoff's Law
Explanation
OPTION A:Faraday's law states that whenever a magnetic flux linking a coil is changed,induced emf is produced in the coil.The magnitude of this induced emf is directly proportional to the number of turns N in the coil and the time rate of change of magnetic flux linkages.OPTION B:Lenz's law states that the polarity of induced e.m.f. is such that it tends to produce a current which opposes the change in magnetic flux that produced it.Hence,B is the correct option.OPTION C:Ohm's law states that The magnitude of the current in a conductor is proportional to the applied voltage as long as the temperature of the conductor is kept constant.OPTION D:Kirchhoff's first law is based on the conservation of charge because the sum of current entering the junction is equal to sum of current leaving the junction. Kirchhoff's second law states that the algebraic sum of potential drops in a closed circuit is zero. So, it is based on the conservation of energy.
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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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