tag:blogger.com,1999:blog-27698739534958796222024-02-28T07:31:06.577+05:30MCQ Answers Guru.PhysicsKerala.inUnknownnoreply@blogger.comBlogger59615tag:blogger.com,1999:blog-2769873953495879622.post-82823860170793354592020-09-06T17:02:00.004+05:302020-09-06T17:14:53.394+05:30A charged rod is touched to a small metallic sphere placed at the origin. This is done at time t = 0. A sensitive field detector detects the electric fields at points 10 cm away and 50 cm away at time t = 1 nanosecond<div style="text-align: justify;"><span style="background-color: white; caret-color: rgb(4, 96, 81); font-family: times; font-size: 19.200000762939453px;">A charged rod is touched to a small metallic sphere placed at the origin. This is done at time </span><em style="caret-color: rgb(4, 96, 81); font-family: times; font-size: 19.200000762939453px; outline: 0px;">t</em><span style="background-color: white; caret-color: rgb(4, 96, 81); font-family: times; font-size: 19.200000762939453px;"> = 0. A sensitive field detector detects the electric fields at points 10 cm away and 50 cm away at time </span><em style="caret-color: rgb(4, 96, 81); font-family: times; font-size: 19.200000762939453px; outline: 0px;">t</em><span style="background-color: white; caret-color: rgb(4, 96, 81); font-family: times; font-size: 19.200000762939453px;"> = 1 nanosecond.</span></div><span style="font-family: times;"><br style="caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px; outline: 0px;" /><span style="background-color: white; caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px;">The expression of Coulomb’s law can match the measured value </span><br style="caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px; outline: 0px;" /><br style="caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px; outline: 0px;" /><span style="background-color: white; caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px;">(a) at 10 cm point but not at 50 cm point</span><br style="caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px; outline: 0px;" /><br style="caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px; outline: 0px;" /><span style="background-color: white; caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px;">(b) at 50 cm point but not at 10 cm point</span><br style="caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px; outline: 0px;" /><br style="caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px; outline: 0px;" /><span style="background-color: white; caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px;">(c) both at 50 cm point and at 10 cm point</span><br style="caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px; outline: 0px;" /><br style="caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px; outline: 0px;" /><span style="background-color: white; caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px;">(d) neither at 50 cm point nor at 10 cm point</span></span><div><span style="font-family: times;"><span style="background-color: white; caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px;"><br /></span></span></div><div style="text-align: center;"><span style="font-family: times;"><span style="background-color: white; caret-color: rgb(4, 96, 81); font-size: 19.200000762939453px;"><a href="https://mcc.physicskerala.in/mcq/enrol/index.php?id=22" rel="nofollow" target=""><b>>>>>>>>></b></a></span></span></div><div class="blogger-post-footer">www.physicskerala.blogspot.com</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2769873953495879622.post-4688892426426216822020-04-23T00:50:00.000+05:302020-04-23T00:50:32.098+05:30If the doping level in a crystal diode is increased, the width of depletion layer ____. (Correct Answer)<div dir="ltr" style="text-align: left;" trbidi="on">
<strong>Question : </strong> If the doping level in a crystal diode is increased, the width of depletion layer ____<br />
(A). remains the same<br />
(B). is decreased<br />
(C). is increased<br />
(D). none of the above<br />
<button id="buttgpvas559" onclick="myFunctiongpvas559()">Show Answer</button> <script> function myFunctiongpvas559() { document.getElementById("buttgpvas559").innerHTML = "Answer is <strong>B</strong><br/>The physical width of the depletion region depends on the doping level. If very heavy doping is used, the depletion region is physically thin because diffusion charge need not travel far across the junction before recombination takes place (short life time). If doping is light, then depletion is more wide (long life time)."; } </script> </div><div class="blogger-post-footer">www.physicskerala.blogspot.com</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2769873953495879622.post-82502503059547804652019-12-23T22:51:00.000+05:302019-12-23T22:53:28.970+05:30Metric coefficients of Spherical Polar coordinates<div dir="ltr" style="text-align: left;" trbidi="on">
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<div class="blogger-post-footer">www.physicskerala.blogspot.com</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2769873953495879622.post-14840997173450757892019-08-11T17:31:00.000+05:302019-08-11T17:34:26.724+05:30A Carnot engine whose low temperature reservoir is at 7 degree Celsius has an efficiency of 50%. If it is desired to increase the efficiency to 70%, by how many degrees should the temperature of the high temperature reservoir be increased ?<div dir="ltr" style="text-align: left;" trbidi="on">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhhpuIfr29l2jFQs4axvM47zYZJBHTMBSrad_7HwDjcHEFiAjqgF3lgwkqweuwKaP_S4fCTaolrW_29hNvjVf-0yNchO6SVqpMOye1u_oHN6YGIH5ZhbCGYo5-eo0_WfdkoxvuVm6KelzM/s1600/image-732531.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_6723878387143324690" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhhpuIfr29l2jFQs4axvM47zYZJBHTMBSrad_7HwDjcHEFiAjqgF3lgwkqweuwKaP_S4fCTaolrW_29hNvjVf-0yNchO6SVqpMOye1u_oHN6YGIH5ZhbCGYo5-eo0_WfdkoxvuVm6KelzM/s800/image-732531.png" width="100%/" /></a></div><div class="blogger-post-footer">www.physicskerala.blogspot.com</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2769873953495879622.post-53627087947168421772019-07-24T11:51:00.000+05:302019-07-24T11:54:23.892+05:30Find the mass of electron and kinetic energy of an electron moving with a velocity 0.99 c<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihfM9XIw3PnjUqHtEsVYNwFfFM9ATfvi21CUYsGhowvu22-vEmMvLfFwum3qFFUGJDM7HJSsuS3DxGREkIfkNNSy-2lxv4X6k_CcSGQjT48v4h9jRxhIX5pj3X__-k-FT66jEVZeaf7CE/s1600/image-736307.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_6717111253059910226" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihfM9XIw3PnjUqHtEsVYNwFfFM9ATfvi21CUYsGhowvu22-vEmMvLfFwum3qFFUGJDM7HJSsuS3DxGREkIfkNNSy-2lxv4X6k_CcSGQjT48v4h9jRxhIX5pj3X__-k-FT66jEVZeaf7CE/s1280/image-736307.png" width="100%" /></a></div>
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