Question

Fleming’s right hand rule gives:
A. Magnitude of the induced emf.
B. Magnitude of the magnetic field.
C. Direction of the induced current.
D. Both magnitude and direction of the induced emf.

Answer 1

Hint: When a conductor such as a wire attached to a circuit moves through a magnetic field an electric current is induced in the circuit due to Faraday’s law of induction. Faraday’s law states that whenever a conductor is placed in a varying magnetic field, an electromotive force is induced. If the conductor circuit is closed, a current is induced which is called induced current. Fleming’s right hand rule gives the direction of this induced current.

Complete answer:
Fleming’s right hand rule gives us the direction of the induced current when a conductor moves in a magnetic field.

Fleming’s right hand rule states to stretch the thumb, forefinger and middle finger of the right hand in such a way that they are mutually perpendicular to each other. If the forefinger indicates the direction of the external magnetic field and thumb shows direction of motion of conductor, then the middle finger will show the direction of induced current in the conductor and hence the direction of induced emf.

So, the correct answer is “Option C”.

Note:
There is also a Fleming’s left hand rule. The rule states that when a conductor carrying current is kept in an outer magnetic field, the conductor feels a force perpendicular to both the field and the direction of current flow. When we stretch the thumb, forefinger and middle finger of the left hand in such a way that they are mutually perpendicular to each other, and if the forefinger points in the direction of magnetic field and the middle finger points in the direction of current, then the thumb will give the direction of motion or the force.