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Questions : #17, #18 & #19 (In Hindi)
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In this lesson solve questions #17, #18 & #19 from the question paper of IIT JEE MAINS 2017 - Set A

Kumar Ketan is teaching live on Unacademy Plus

Kumar Ketan
#6 years teaching experience #Physics Faculty in Kota #"magical education" (200k+ subs) #Follow for Physics of JEE NEET AIIMS etc. #Writer

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  2. 26.4k views 4.9 unacademy Kumar Ketan #16 Educator in IIT JEE #6 years teaching experience #IT JEE Physics #YouTuber (150k+ subs) #Unacademy educator(25kt lifetimeviews) #Under graduate topper Follow me on the Unacademy Learning App 1.3k 2 26 Followers Following Courses Get updates about new courses Watch all my lessons .Download slides and watch offline Lists (1) Kumar Ketan HINDI IIT JEE Physics by Kumar Ketan for lIT JEE 8 4 saves Kumar Ketan


  3. IIT JEE 2017 PHYSICS Q. #1 to Q. #30 INDIAN IAN INSTITUTE Complete Paper Solution


  4. Question 17 2 V 2 V 2 V 1 1 1 2 V 2 V 2 V In the above circuit the current in each resistance is (1) 1 A (2) 0.25 A (3) 0.5 A (4) 0 A


  5. Sol. The potential difference in each loop is zero. . No current will flow.


  6. Question 18 A magnetic needle of magnetic moment 6.7 10-2 Amp and moment of inertia 7.5 10-6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is (1) 6.65 s (2) 8.89 s (3) 6.98 s (4) 8.76 s


  7. Sol. T= 2 MB = 2 41-7.5x10-6 - 1.06 10 = 6.7 10-2 0.01 For 10 oscillations, t = 10T= 2 1.06 = 6.6568 6.65 s


  8. Question 19 When a current of 5 mA is passed through a galvanometer having a coil of resistance 15 , it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 0-10 V is (1) 1.985 x 1030 (2) 2.045 x 1030 (3) 2.535 x 103n (4) 4.005 x 1030


  9. 1,-5 10-3A Let series resistance be R. 10 5 10-3 (R + 15) Sol. R = 2000-15 = 1985 = 1.985 103


  10. Question 20 In a coil of resistance 100 0, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is 10 Current (amp.) (1) 200 Whb (2) 225 Wb (3) 250 Wb (4) 275 Whb 0.5 s Time


  11. Question 21 An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If Amin is the smallest possible wavelength of X-ray in the spectrum, the variation of log min with log V is correctly represented in (1) log (3) log log V log V (4) log (2) log og V log V