{"id":52854,"date":"2024-04-15T23:45:27","date_gmt":"2024-04-15T23:45:27","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=52854"},"modified":"2024-04-15T23:45:27","modified_gmt":"2024-04-15T23:45:27","slug":"the-change-in-resistance-of-a-metal-wire-owing-to-strain-is-due-to-s1-change-in-dimension-of-wire-expressed-by-factor-1-2a%c2%b5-s2-change-in-resistance","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-change-in-resistance-of-a-metal-wire-owing-to-strain-is-due-to-s1-change-in-dimension-of-wire-expressed-by-factor-1-2a%c2%b5-s2-change-in-resistance\/","title":{"rendered":"The change in resistance of a metal wire owing to strain is due to S1: Change in dimension of wire expressed by factor (1-2\u00c2\u00b5) S2: Change in resistance ?"},"content":{"rendered":"<p>\r\n    <!-- Check if it's an AMP page -->\r\n            <!-- Non-AMP version -->\r\n        <div class=\"mcq-container\" data-quiz-id=\"quizState_6a97369af4048\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"false\">\r\n                    S1 is true &amp; S2 is false                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"false\">\r\n                    S2 is true &amp; S1 is false                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"true\">\r\n                    Both S1 &amp; S2 are true                <\/div>\r\n                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    Both S1 &amp; S2 are false                <\/div>\r\n                            \r\n            <!-- Feedback messages for non-AMP -->\r\n            <div class=\"feedback\" data-feedback=\"wrong\">Answer is Right!<\/div>\r\n            <div class=\"feedback\" data-feedback=\"right\">Answer is Wrong!<\/div>\r\n        <\/div>\r\n\r\n        <script>\r\n        document.addEventListener('DOMContentLoaded', function () {\r\n            var containers = document.querySelectorAll('.mcq-container');\r\n\r\n            containers.forEach(function(container) {\r\n                var options = container.querySelectorAll('.option');\r\n                var feedbackSelect = container.querySelector('[data-feedback=\"select\"]');\r\n                var feedbackWrong = container.querySelector('[data-feedback=\"wrong\"]');\r\n                var feedbackRight = container.querySelector('[data-feedback=\"right\"]');\r\n\r\n                options.forEach(function(option) {\r\n                    option.addEventListener('click', function() {\r\n                        var selectedOption = option.getAttribute('data-option-key');\r\n                        var isCorrect = option.getAttribute('data-is-correct') === 'true';\r\n\r\n                        \/\/ Remove previous selections\r\n                        options.forEach(function(opt) {\r\n                            opt.classList.remove('correct', 'incorrect');\r\n                        });\r\n\r\n                        \/\/ Add the correct\/incorrect class\r\n                        if (isCorrect) {\r\n                            option.classList.add('correct');\r\n                            feedbackRight.hidden = false;\r\n                            feedbackWrong.hidden = true;\r\n                        } else {\r\n                            option.classList.add('incorrect');\r\n                            feedbackRight.hidden = true;\r\n                            feedbackWrong.hidden = false;\r\n                        }\r\n\r\n                        \/\/ Hide select feedback\r\n                        feedbackSelect.hidden = true;\r\n                    });\r\n                });\r\n            });\r\n        });\r\n        <\/script>\r\n    \r\n    <!--more--><\/p>\n<p>The correct answer is C. Both S1 and S2 are true.<\/p>\n<p>When a metal wire is stretched, its length increases and its cross-sectional area decreases. This change in dimensions causes the resistance of the wire to increase. The change in resistance can be calculated using the following equation:<\/p>\n<p>$R_f = R_o(1 &#8211; 2\\mu)$<\/p>\n<p>where $R_f$ is the final resistance, $R_o$ is the original resistance, and $\\mu$ is the strain.<\/p>\n<p>Strain is a measure of how much the length of the wire changes relative to its original length. It is calculated using the following equation:<\/p>\n<p>$\\mu = \\frac{\\Delta L}{L_o}$<\/p>\n<p>where $\\Delta L$ is the change in length and $L_o$ is the original length.<\/p>\n<p>The change in resistance due to strain is caused by the change in the cross-sectional area of the wire. When the wire is stretched, its cross-sectional area decreases. This decrease in cross-sectional area causes the current density to increase. The current density is the current per unit area of the wire. The increase in current density causes the resistance of the wire to increase.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Join Our Telegram Channel Subscribe on YouTube<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[740],"tags":[],"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>The change in resistance of a metal wire owing to strain is due to S1: Change in dimension of wire expressed by factor (1-2\u00c2\u00b5) S2: Change in resistance ?<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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