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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
#Specialisation in Electronics #6 years teaching experience #Physics Faculty in Kota #"magical education" (211k+ subs) #Writer

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Shivanshu Atrey
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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