07-11-2017, 08:10 PM
Kis part se +ve charge aur kis part se -ve charge flow karta hai?
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study of hall effect experiment viva questions with answers
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Kis part se +ve charge aur kis part se -ve charge flow karta hai?
08-11-2017, 03:40 PM
Q. What is the Hall effect?
A. When a current-carrying conductor is placed in a magnetic field mutually perpendicular to the direction of the current, a potential difference at right angles to the magnetic and electric fields develops. This phenomenon is called the Hall effect.
Q. Define the room coefficient.
A. It is numerically equal to the Hall electric field induced in the sample crystal by the current of the unit when it is placed perpendicular in a magnetic field of 1 weber / (meter * meter).
Q. Define mobility.
A. It is the relationship between the average drift velocity of the charge carriers and the applied electric field.
Q. Why is the Hall potential developed?
A. When a current carrying conductor is placed in a transverse magnetic field, the magnetic field exerts a deflection force (Lorentz force) in the direction perpendicular to the magnetic field and the drift velocity, this causes the charges to change from a surface to another thus creating a potential difference.
Q. What is the rule of Fleming's left hand?
A. Stretch the thumb, the first finger, the middle finger at right angles to each other, so that the index finger points in the direction of the magnetic field, the middle finger in the direction of the current, then the thumb will point in the direction of the force acting on him.
Q. How does mobility depend on electrical conductivity?
A. It is directly proportional to the conductivity.
Q. Define the Hall angle.
A. It is the angle made with the direction x by the drift velocity of the load carrier that is known as the corridor angle.
Q. What type of cargo is more mobile?
A. In semiconductors, the electron has more mobility than holes.
Q. What happens to the room coefficient when the number of charge carriers is reduced?
A. The coefficient of A.Hall increases with the decrease in the number of charge carriers per unit volume.
Q. Name a practical use.
A. It is used to verify if a substance is a semiconductor, conductor or insulator. The nature of the charge carriers can be measured.
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