Question

Why do we reverse the direction of magnetic field in hall effect?

Answer 1

When a magnetic field is applied at right angle to a conductor carrying current, a voltage is developed across the conductor in a direction perpendicular to both , the current and the magnetic field. This is called Hall voltage.

The Hall coefficient/constant is a constant for the given conductor. On reversing the direction of (a) magnetic foield (b) current, or both the polarity of the Hall voltage developed changes with each reversal, but the Hall coefficient does not change sign.

Importance of Hall Effect:

It gives the following important quantities:

The sign of the current carriers is determinedThe magnitude of the Hall coefficient, the number of charge carriers per unit volume can be calculated.The mobility of charge carriers can be determined directly.Hall effect can be used to decide if the material is a metal, semiconductor or an insulator.
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Answer 2

Concept Introduction:

An electric charge, an electric current, and magnetic materials are all affected magnetically by a magnetic field, which is a vector field. A pressure perpendicular to the magnetic flux and its own velocity acts on a current-carrying conductor in a magnetic field.

Explanation:

We have been given a question about magnetic fields.

We have to write the reason for the reversion of the direction of the magnetic field in the hall effect.

For the particular conductor, the Hall coefficient or constant is a fixed value. The direction of the Hall voltage created changes with each inversion of the magnetic field current's direction or both, while the Hall coefficient remains constant.

Final Answer:

The final answer is the direction of the Hall voltage created changes with each inversion of the magnetic field current's direction or both.

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