Sign up now
to enroll in courses, follow best educators, interact with the community and track your progress.
Questions : #12, #13 & #14 (In Hindi)
62 plays

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

Unacademy user
Kumar Ketan
5 months ago
A new Plus Course by *Kumar Ketan* in the *IIT-JEE* Category is now Live! Course Name - * Most Important Concepts of Modern & Nuclear Physics for JEE Main 2019* Course Enrolment Fee - Rs. 999/- Total Sessions - 5 sessions Promotional text - Registrations open for a few days ONLY. Last Date of Enrolment – 23rd December 2018 Link -
  1. ne

  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 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