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HALL.html
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<!doctype html PUBLIC"-//W3C//DTD XHTML 1.0 Strict //EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml-strict.dtd">
<html xml:lang="en" xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<title>HALL EFFECT</title>
<link rel="stylesheet" href="layout.css" media="screen" />
</head>
<body background="images/bg.jpg">
<div id="container">
<div id ="content">
<h1 align="center">PHYSICS VIVA QUESTION</h1><br><br><br>
<h2 align="center" font-size-adjust:200px><B><i>HALL EFFECT</B></h2><br><br>
<p>
<b>Q.What is Hall Effect?</b><br><br>
<b>A</b>.When a current carrying conductor is placed in a magnetic field mutually perpendicular to the direction of current a potential difference is developed at right angle to both<br>
the magnetic and electric field.This phenomenon is called Hall effect. <br><br>
<b>Q.Define hall co-efficient. </b><br><br>
<b>A</b>.It is numerically equal to Hall electric field induced in the specimen crystal by unit current when it is placed perpendicular in a magnetic field of 1 weber/(meter*meter). <br><br>
<b>Q.Define mobility. </b><br><br>
<b>A</b>.It is the ratio of average drift velocity of charge carriers to applied electric field. <br><br>
<b>Q.Why is Hall potential developed? </b><br><br>
<b>A</b>.When a current carrying conductor is placed in a transverse magnetic field the magnetic field exerts a deflecting force(Lorentz Force) in the direction perpendicular to both<br>
magnetic field and drift velocity this causes charges to shift from one surface to another thus creating a potential difference. <br><br>
<b>Q.What is Fleming’s Left Hand Rule? </b><br><br>
<b>A</b>.Stretch thumb,first finger,middle finger at right angles to each other such that fore finger points in the direction of magnetic field,middle finger in the direction of<br>
current then thumb will point in the direction of the force acting on it. <br><br>
<b>Q.How does mobility depend on electrical conductivity? </b><br><br>
<b>A</b>.It is directly proportional to conductivity. <br><br>
<b>Q.Define Hall angle. </b><br><br>
<b>A</b>.It is the angle made with the x direction by the drift velocity of charge carrier is known as hall angle. <br><br>
<b>Q.Which type of charge has greater mobility? </b><br><br>
<b>A</b>.In semiconductors,electron has greater mobility than holes.<br><br>
<b>Q.What happens to the hall coefficient when number of charge carriers is decreased? </b><br><br>
<b>A</b>.Hall coefficient increases with decrease in number of charge carriers per unit volume.<br><br>
<b>Q.Name one practical use.</b> <br><br>
<b>A</b>.It is used to verify if a substance is a semiconductor,conductor or insulator.Nature of charge carriers can be measured. <br><br><br><br>
<b><i>Read about semiconductors too.</i></b>
</p>
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