Chapter 22. Faraday’s law and Lenz’s law for induction (20-3)

Question

xzpKO/F/zXwdkqyoUlcE9J3AAOSAaMeNCD0WbvcRNveV3B0mNsr+yg==

{"title":"Induced or motional emf in a loop","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"1,64,28,98\"}]"} {"title":"Change in the magnetic flux through the surface outlined by the loop","description":"Incorrect","type":"incorrect","color":"#008000","code":"[{\"shape\":\"rect\",\"coords\":\"175,8,221,56\"}]"} {"title":"Time interval over which the change in magnetic flux takes place","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"194,98,222,136\"}]"} {"title":"The negative sign indicates that the current caused by the emf induces a magnetic field which opposes the change in flux.","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"82,69,129,91\"}]"}

Question

FPeOmm2Hkz2wFl0xHELnGBC9huajwH7VTtuOd0t2RAKfW7pjGlA+oZugm54VJIhYmmIg8QhZ/4G9YI/6PzKHf+IUEznzfl10

{"title":"Induced or motional emf in a loop","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"1,64,28,98\"}]"} {"title":"Change in the magnetic flux through the surface outlined by the loop","description":"Correct!","type":"correct","color":"#008000","code":"[{\"shape\":\"rect\",\"coords\":\"175,8,221,56\"}]"} {"title":"Time interval over which the change in magnetic flux takes place","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"194,98,222,136\"}]"} {"title":"The negative sign indicates that the current caused by the emf induces a magnetic field which opposes the change in flux.","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"82,69,129,91\"}]"}

Question

ANTPJu2UK12DFGKgtM+5KPaaQmVuFNmz8cvIsPUcAJzn066Q9COL4SAbkP4g7I6UdYuDv9Fkrr+XKkWFM6/y97cSEOE=

{"title":"Induced or motional emf in a loop","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"1,64,28,98\"}]"} {"title":"Change in the magnetic flux through the surface outlined by the loop","description":"Wrong","type":"incorrect","color":"#008000","code":"[{\"shape\":\"rect\",\"coords\":\"175,8,221,56\"}]"} {"title":"Time interval over which the change in magnetic flux takes place","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"194,98,222,136\"}]"} {"title":"The negative sign indicates that the current caused by the emf induces a magnetic field which opposes the change in flux.","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"82,69,129,91\"}]"}

Question

FHqnqwGnxVquIINtKDtL2HqGsVnU50JMIyeX1vQSycEfPeqjPeaNvCrXe4vwJOdjFmBXWuDqy4WXk7x+KTCj8R/+nSZ/MdujRiiC6q72MMwo48hoT+bbLuGOLI0qZqrHP7iQRuwi3OoBcLuhlA4OJjrPribASRYwwhOPFVWzT3A=

{"title":"Induced or motional emf in a loop","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"1,64,28,98\"}]"} {"title":"Change in the magnetic flux through the surface outlined by the loop","description":"Wrong","type":"incorrect","color":"#008000","code":"[{\"shape\":\"rect\",\"coords\":\"175,8,221,56\"}]"} {"title":"Time interval over which the change in magnetic flux takes place","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"194,98,222,136\"}]"} {"title":"The negative sign indicates that the current caused by the emf induces a magnetic field which opposes the change in flux.","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"82,69,129,91\"}]"}

Review

The third of Maxwell’s equations is Faraday’s law, which we introduced in Sections 20-2 and 20-3. It states that an emf is induced in a loop if the magnetic flux through that loop changes: