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## 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

U
1-a 2-c 3-c 4-d
Deepshikha Goswami
7 months ago
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sir bs last wala question hogya lekin starting wale dono nhi hue😔 lekin smjh m ahgye😊
1. unacademy 62.9k views 4.8 Kumar Ketan Follow me on the Unacademy #15 Educator in IIT JEE #6 years teaching experience #IIT JEE Physics #YouTuber 'magical education" (170k+ subs) #Unacademy educator (60k+ lifetin eviews) 3k 2 37 Followers Following Courses Get updates about new courses . Watch all my lessons . Download slides and watch offline Message Lists (1) Kumar Ketan HINDI IT JEE Physics by Kumar Ketan for IT JEE 52 saves Kumar Ketan

2. The distancebetween plates of a parallel plate capacitor is 5d. The positively charged plate is at x 0 and negatively charged plate is at x= 5d. Two slabs one of conductor andthe other of a dielectric of same thickness d are inserted between the plates as shown in figure. Potential (V) versus distance (x) graph will be 0 d 2d 3d 4d 5d

3. O d 2d 3d 4d 5d O d 2d 3d 4d 5d 0 d.2d 3d 4d 5d 0 d 2d 3d 4d 5d

4. Since electric field E (slope of V-x graph) and E inside a conductor O slope of V-x graph between x = d to x = 2d should be zero. also E in air > E in dielectric .. Slope in airl>Islope in dielectricl option (b) satisfies all conditions.

5. The frequency of a sonometer wire is u, but when the weights producing the tensions are completely immersed in water the frequency becomes u/2 and on immersing the weights in a certain liquid the frequency becomes u/3. The specific gravity of the liquid is 16 9 15 12 32 (d) 27 4 3

6. Since frequency uoc VT Where T is tension in sonometer wire 0 Vpg air air water

7. 0 or or 2_ 4. Similarly in second case 4 3 VW 4 4 3 Pw

8. PL Here specific gravity of the liquid s VW 4 4 3s 36 27s 4 32 27 9= s=

9. A particle moves in the x-y plane under the influence of a force such that its linear momentum is p(t) A[i cos(kt) -jsin(kt) where A and k are constants. The angle between the force and the momentum is (a) 0 (b) 30 (c) 45 (d) 90

10. Here, p(t) = Alicos(kt)-1 sin(kt)] . .. (i) F- Akl-isin(kt)-jcos(kt)] (i) dt From equation (i) and (ii) Since | Fland |pl are not equal to zero. cos 0. 900.