{"id":20208,"date":"2024-04-15T05:49:50","date_gmt":"2024-04-15T05:49:50","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=20208"},"modified":"2024-04-15T05:49:50","modified_gmt":"2024-04-15T05:49:50","slug":"if-overrightarrow-rma-rmxyrmhat-a_rmx-rmx2rmhat-a_rmyointlimits_rmc-overrightarrow-rma-cdot-rmdoverri","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/if-overrightarrow-rma-rmxyrmhat-a_rmx-rmx2rmhat-a_rmyointlimits_rmc-overrightarrow-rma-cdot-rmdoverri\/","title":{"rendered":"If \\[\\overrightarrow {\\rm{A}} = {\\rm{xy}}{{{\\rm{\\hat a}}}_{\\rm{x}}} + {{\\rm{x}}^2}{{{\\rm{\\hat a}}}_{\\rm{y}}},\\,\\oint\\limits_{\\rm{c}} {\\overrightarrow {\\rm{A}} \\cdot {\\rm{d}}\\overrightarrow l } \\] over the path shown in the figure is A. 0 B. \\[\\frac{2}{{\\sqrt 3 }}\\] C. 1 D. \\[2\\sqrt 3 \\]"},"content":{"rendered":"<p>[amp_mcq option1=&#8221;0&#8243; option2=&#8221;\\[\\frac{2}{{\\sqrt 3 }}\\]&#8221; option3=&#8221;1&#8243; option4=&#8221;\\[2\\sqrt 3 \\]&#8221; correct=&#8221;option3&#8243;]<!--more--><\/p>\n<p>The correct answer is $\\boxed{0}$.<\/p>\n<p>The circulation of a vector field $\\overrightarrow{A}$ around a closed path $\\Gamma$ is given by the following integral:<\/p>\n<p>$$\\oint_\\Gamma \\overrightarrow{A} \\cdot d\\overrightarrow{l}$$<\/p>\n<p>In this case, the vector field is $\\overrightarrow{A} = xy\\hat{\\imath} + x^2\\hat{\\jmath}$ and the path is a triangle with vertices $(0,0)$, $(1,0)$, and $(1,1)$. The line integral over this path can be evaluated as follows:<\/p>\n<p>$$\\oint_\\Gamma \\overrightarrow{A} \\cdot d\\overrightarrow{l} = \\int_0^1 xy\\,dx + \\int_0^1 x^2\\,dy$$<\/p>\n<p>The first integral can be evaluated using the substitution $u = x$, which gives:<\/p>\n<p>$$\\int_0^1 xy\\,dx = \\int_0^1 u^2\\,du = \\frac{1}{3}$$<\/p>\n<p>The second integral can be evaluated using the substitution $v = y$, which gives:<\/p>\n<p>$$\\int_0^1 x^2\\,dy = \\int_0^1 v^2\\,dv = \\frac{1}{3}$$<\/p>\n<p>Therefore, the total line integral is:<\/p>\n<p>$$\\oint_\\Gamma \\overrightarrow{A} \\cdot d\\overrightarrow{l} = \\frac{1}{3} + \\frac{1}{3} = 0$$<\/p>\n<p>The other options are incorrect because they do not represent the correct value of the line integral.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[amp_mcq option1=&#8221;0&#8243; option2=&#8221;\\[\\frac{2}{{\\sqrt 3 }}\\]&#8221; option3=&#8221;1&#8243; option4=&#8221;\\[2\\sqrt 3 \\]&#8221; correct=&#8221;option3&#8243;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[690],"tags":[],"class_list":["post-20208","post","type-post","status-publish","format-standard","hentry","category-calculus","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>If \\[\\overrightarrow {\\rm{A}} = {\\rm{xy}}{{{\\rm{\\hat a}}}_{\\rm{x}}} + {{\\rm{x}}^2}{{{\\rm{\\hat a}}}_{\\rm{y}}},\\,\\oint\\limits_{\\rm{c}} {\\overrightarrow {\\rm{A}} \\cdot {\\rm{d}}\\overrightarrow l } \\] over the path shown in the figure is A. 0 B. \\[\\frac{2}{{\\sqrt 3 }}\\] C. 1 D. \\[2\\sqrt 3 \\]<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/if-overrightarrow-rma-rmxyrmhat-a_rmx-rmx2rmhat-a_rmyointlimits_rmc-overrightarrow-rma-cdot-rmdoverri\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"If \\[\\overrightarrow {\\rm{A}} = {\\rm{xy}}{{{\\rm{\\hat a}}}_{\\rm{x}}} + {{\\rm{x}}^2}{{{\\rm{\\hat a}}}_{\\rm{y}}},\\,\\oint\\limits_{\\rm{c}} {\\overrightarrow {\\rm{A}} \\cdot {\\rm{d}}\\overrightarrow l } \\] over the path shown in the figure is A. 0 B. \\[\\frac{2}{{\\sqrt 3 }}\\] C. 1 D. \\[2\\sqrt 3 \\]\" \/>\n<meta property=\"og:description\" content=\"[amp_mcq option1=&#8221;0&#8243; 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