{"id":2223,"date":"2023-10-02T11:09:14","date_gmt":"2023-10-02T11:09:14","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=2223"},"modified":"2023-10-02T11:23:37","modified_gmt":"2023-10-02T11:23:37","slug":"week-9-ss1-second-term-physics-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-9-ss1-second-term-physics-notes\/","title":{"rendered":"Week 9 &#8211; SS1 Second Term Physics Notes"},"content":{"rendered":"<p>\u00a0<strong>WEEK NINE<\/strong><br \/>\n\t\t<strong>TOPIC:<\/strong><br \/>\n\t\t\t<strong>Electric Field \u2013 Line of Forces, Properties of Line of Force, Description and     Properties of Force Field<br \/>\n<\/strong><strong>CONTENT<br \/>\n<\/strong><\/p>\n<ul>\n<li>\n<div><strong>Electric Field<br \/>\n<\/strong><\/div>\n<\/li>\n<li>\n<div><strong>Line of Force and properties<br \/>\n<\/strong><\/div>\n<p>\u00a0\u00a0\u00a0\u00a0<br \/>\n\u00a0<\/li>\n<li>\n<div><strong>Electric Field<\/strong>\n\t\t\t\t<\/div>\n<\/li>\n<\/ul>\n<p>Electric field is defined as any region where a charge experiences a force of electrical origin. There are two types of charges namely : positive and negative charges.<\/p>\n<p>\u00a0<strong>Lines of Force<br \/>\n<\/strong>An electric field has been defined as a region where an electric force is experienced. Electric fields can be mapped out by electrostatic lines of force. An electrostatic line of force may be defined as a line whose tangent is in the direction of the force on small positive charge at that point. Arrows on the lines of force show the direction of the force on a positive charge. The force on a negative charge is in the opposite direction.<\/p>\n<p>\u00a0Since the direction of a field varies from point to point, lines of force are usually curves.<\/p>\n<p>\u00a0<br \/>\n\u00a0<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100223_1109_Week9SS1Se1.png\" alt=\"\"\/><img decoding=\"async\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100223_1109_Week9SS1Se2.png\" alt=\"\"\/><img decoding=\"async\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100223_1109_Week9SS1Se3.png\" alt=\"\"\/><strong><br \/>\n\t\t\t<\/strong>Fig 4.1: Lines of Electrostatic force<\/p>\n<p>\u00a0(i) Isolated positive charge\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) Isolated negative charge\u00a0\u00a0\u00a0\u00a0<br \/>\n(iii) Unlike charges \u2013 positive and negative charges \u00a0\u00a0\u00a0\u00a0 (iv) like charges \u2013 positive and positive charges<\/p>\n<p>\u00a0<strong>Properties of Lines of Force<br \/>\n<\/strong>1.\u00a0\u00a0\u00a0\u00a0Lines of force never intersect.<br \/>\n2.\u00a0\u00a0\u00a0\u00a0Lines of force are usually curves, as the direction of a field varies from point to point.<br \/>\n3.\u00a0\u00a0\u00a0\u00a0In a uniform field, the lines of force are straight, parallel and uniformly spaced.<br \/>\n4.\u00a0\u00a0\u00a0\u00a0No lines of force originate or terminate in the space surrounding a charge.<br \/>\n5.\u00a0\u00a0\u00a0\u00a0Every lines of force in an electrostatic field is a continuous line terminated by a positive charge at one end and a negative charge at the other end.<\/p>\n<p>\u00a0<strong>Coloumb&#8217;s Law<\/strong> states that the force experience by two charges Q1Q2 separated by a distance r is directly proportional to their product of their charges and inversely proportional to the square of their distance apart. It is also known as inverse square law.<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100223_1109_Week9SS1Se4.png\" alt=\"\"\/>Q1                                              Q2    <\/p>\n<p>\u00a0F \u03b1 Q1Q2<br \/>\nF\u03b1 1\/r2<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100223_1109_Week9SS1Se5.png\" alt=\"\"\/>F \u03b1 Q1Q2      <\/p>\n<p>\u00a0         r\u00b2<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100223_1109_Week9SS1Se6.png\" alt=\"\"\/>F = K Q1Q2   __________ (i)<br \/>\n            r\u00b2<br \/>\nK = 9 x 10<sup>9<\/sup> Nm\u00b2 C<sup>-2<\/sup> \u2044 f\/m<br \/>\nK = 1<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100223_1109_Week9SS1Se7.png\" alt=\"\"\/>      4\u03a9\u0404<sub>0<\/sub><br \/>\n\t\t(Permitivity of Free Space vacuum)<\/p>\n<p>\u00a0<strong>EVALUATION<br \/>\n<\/strong><\/p>\n<ol>\n<li>\n<div>State four properties of line of force.\n<\/div>\n<\/li>\n<li>\n<div>State coulomb&#8217;s law.\n<\/div>\n<\/li>\n<\/ol>\n<ul>\n<li>\n<div><strong>Electric Field Intensity (E)<br \/>\n<\/strong><\/div>\n<p>It is simply the force per unit charge. It is a vector quantity and measured in<br \/>\nE = F\/Q _________ (iii)\n<\/li>\n<li>\n<div><strong>Electric Field Potential (V)<br \/>\n<\/strong><\/div>\n<\/li>\n<\/ul>\n<p>It is the work done in moving a unit positive charge from it point of infinity to a point in the field. It can also be defined as work done per unit charge, it is a scalar quantity and measured in joules per coloumb or volt.<br \/>\nV = W<br \/>\n\t\t       Q  <\/p>\n<p>\u00a0<\/p>\n<ul>\n<li>\n<div><strong>Flux Density D.<br \/>\n<\/strong><\/div>\n<p>It is denoted by D. It is simply charge by unit area. It is measured in Cm-2\/ Clm\u00b2<br \/>\n\u00a0\u00a0\u00a0\u00a0D = Q<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100223_1109_Week9SS1Se8.png\" alt=\"\"\/>                    A   <\/p>\n<p>\u00a0<strong>EVALUATION<br \/>\n<\/strong><\/li>\n<\/ul>\n<ol>\n<li>\n<div>Define A. electric field intensity B. electric field potential\n<\/div>\n<\/li>\n<li>\n<div>Differentiate between electric potential and electric potential energy<strong><br \/>\n\t\t\t\t\t<\/strong><\/div>\n<p>\u00a0<strong>Reading Assignment<br \/>\n<\/strong>New School Physics pg 72 &amp; 73<\/p>\n<p>\u00a0<strong>WEEKEND ASSIGNMENT<br \/>\n<\/strong><\/li>\n<li>\n<div>The SI unit of flux density is A. Cm<sup>2 <\/sup>B. Cm C. Cm<sup>-2<\/sup> D. C\n<\/div>\n<\/li>\n<li>\n<div>Electric potential is a scalar quantity A. true B. false C. cannot say D. none of the above\n<\/div>\n<\/li>\n<li>\n<div>Electric field intensity is a scalar quantity A. true B. false C. cannot say D. none of the above\n<\/div>\n<\/li>\n<li>\n<div>The SI unit of electric potential energy is \u2026\u2026\u2026. A. volt B. Joules per coulomb\n<\/div>\n<p>C. Joules D. Cm<sup>2<\/sup>\n\t\t\t\t<\/li>\n<li>\n<div>Line of force are maginary A. true B. false C. cannot say D. none of the above\n<\/div>\n<p>\u00a0<strong>THEORY<\/strong>\n\t\t\t\t<\/li>\n<li>\n<div>The force  acting  on an electron carrying a charge of 1.6X10<sup>-19<\/sup> C in an electric field of intensity 5X10<sup>8<\/sup> Vm<sup>-1<\/sup>.\n<\/div>\n<\/li>\n<li>\n<div>1f 20MJ of work is done in moving a 5\u00b5C of charge between two points  in an electric field, the potential difference between the two points is?\n<\/div>\n<p>\t\t\t\t\u00a0<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0WEEK NINE TOPIC: Electric Field \u2013 Line of Forces, Properties of Line of Force, Description&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,191],"tags":[],"class_list":["post-2223","post","type-post","status-publish","format-standard","hentry","category-posts","category-second-term-ss1-physics"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/2223","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=2223"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/2223\/revisions"}],"predecessor-version":[{"id":2224,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/2223\/revisions\/2224"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=2223"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=2223"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=2223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}