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ATC RANKERS TEST SERIES -04 PHYSICS
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a)sameenergy b)velocity c)wavelength d)frequency
9.Whichoneofthefollowingarenotelectromagneticwaves
a)CosmicRays b)GammaRays c)βrays d)Xrays
10.Theelectromagneticradiationsusedinfoodprocessingsterilizingagentis
a)microwave b)UVrays c)Gamarays d)radiowaves
Section-B(subjectivetypequestions)
1.Givethedirectioninwhichtheinducedcurrentflowinthecoil
mountedonaninsulatingstandwhenabarmagnetisquicklymoved
alongtheaxisofthecoilfromonesidetotheotherasshowninthe
figure.
2.Showdiagrammaticallywhenismagneticfluxtakenaspositiveandnegative.
3.Define1Henry.
4.Whatistheorigenofdisplacementcurrent?
5.Longdistanceradiobroadcastuseshortwavebands,why?
6.Findthewavelengthofelectromagneticwavesoffrequency6x10¹²Hzinfreespace.Giveitstwo
applications.
7.Aradiocantuneintoanystationin7.5Hzto12MHz.Whatisthecorrespondingwavelengthband?
8.Explainbrieflyhowelectromagneticwavesareproducedbyanoscillating
charge.Howisthefrequencyofemwavesproducedrelatedtothatof
oscillatingcharge?
9.Inthegivendiagram,acoilBisconnectedtolowvoltagebulbLandand
placedparalleltoanothercoilAasshown.Explainthefollowingobservationsa)bulblightsandb)bulb
getsdimmerifthecoilbmovesupward.
10.Bothalternatingcurrentanddirectcurrentaremeasuredinamperes.Buthowistheamperedefined
foranalternatingcurrent?
11.DrawaschematicdiagramofasetupTransformer.Explainitsworkingprinciple.Deducethe
expressionforthesecondarytoprimaryvoltageintermsofthenumberofturnsinthetwocoilinan
idealTransformer.Howistheratiorelatedtothecurrentsinthetwocoils?