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Questions : #12, #13 & #14 (In Hindi)
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In this lesson solve questions #12, #13 & #14 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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Pawan Chandani
3 months ago
I've uploaded DC bridges...just search with DC bridges Pawan Chandani
Muxmal 2
3 months ago
Thank you sir
thank u sir
Kumar Ketan
10 months ago
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3. IIT JEE 2017 PHYSICS Q. #1 to Q. #30 INDIAN IAN INSTITUTE Complete Paper Solution

4. Question 12 A particle is executing simple harmonic motion with a time period T. At time t = 0, it is at its position of equilibrium. The kinetic energy-time graph of the particle wil look like: KE KE (3) - 2 2 KE KE 4 2

5. Sol. K.Emo A2 cos2 cot 2 KE I T

6. Question 13 An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observer? (speed of light 3 x 108 ms-1) (1) 10.1 GHz (2) 12.1 GHz (3) 17.3 GHz (4) 15.3 GHz

7. Sol. For relativistic motion f- fo G+V v- relative speed of approach 0 C -V C + 102 103-17.3 GHz f-10 10v3 17.3 GHz 2

8. Question 14 An electric dipole has a fixed dipole moment p, which makes angle 8 with respect to x-axis. When subjected to an electric field E1 Ei, it experiences a torque T1=t. When subjected to another electric field E23Ei it experiences a torque The angle is T2 =-T1 . (1) 30 (2) 45 (3) 60 (4) 90

9. Sol. From (i) and (ii) -1 = Ei tan = V3 60 = pXE1 tk-pE sin (-k)

10. Question 15 A capacitance of 2uF is required in an electrical circuit across a potential difference of 1.0 kV. A large number of 1uF capacitors are available which can withstand a potential difference of not more than 300 V. The minimum number of capacitors required to achieve this is (2) 16 (3) 24 (4) 32