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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
Unacademy user
mam uppsc agar september me hai to kha se current affair ke liye pdhna suru krna hoga
Priyanka Verma
2 years ago
Hi Ashendra..! daily newspaper is must.Other than that buy book from market , otherwise there are many educators on this platteform providing course for current affairs..u can follow any one of them..:)
aur 2 isley nhi kiye kyuki abhi meins vo chapters phde nhi the
Kumar Ketan
8 months ago
In Dono chapters K formula ek page pr alg se note kr lijiye
Mohit garg
8 months ago
ok sir
Mohit garg
8 months ago
sir iska part 2 jrur bnana
Mohit garg
8 months ago
it really helps me..
sir 2nd wala hogya that first wala lag rha tha lekin calculation error hogyi 3rd question m dD ki value %error haj Woh 10^-1se pta lgya hai sir
sir 22 correct hua

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. In the circuit shown in figure, the current gain, 100 for the transistor. What would be the base resistance so that VCE = 5 V? (Neglect VSE) 10 VVcc E VCE BE IE (a) 2x 103 (c) 1 106 (b) 2>< 105 (d) 500

3. Here, = 100, VCE = 5 V, VCC-10 V =1C or ID=le =le As 100 Also, VCE Vcc IcRL or 5V= 10 V-Ic 1000 5 V =5 10-3 A .. c 1000

4. and IR =5 10-3A =5 10-5 A (Using (i) 100 Thus, RgCCBE 10 V =2x 10"(2 (neglecting VBE) 5 10", A

5. An oil drop of n excess electrons is held stationary under a constant electric field E in Millikan's oil drop experiment. The density of oil is p. The radius of the drop is 11/2 3neE 2neE (d) 3nps (a) 3nelE (c) l-one 4T0Pg 4TteE

6. Let r be radius of the drop. Then the mass of the drop is 4 -volume x density tr3 Since the drop has n excesselectrons therefore it is negatively charged and the charge E on the drop is 3 n excess electrons qE mg

7. As the drop is held stationary under the constant electric field E, .. weight of the drop force on the drop due to electric field mg qE 4 1/3 3 4TPg

8. Displacement method is applicable to determine the focal length of convex lens. In this method, the applicable formula is 2 2 4 D Object Screen

9. Here, D distance between object plane and screen on which image is formed, f focal length of lens, x distance between two position of lens. To determine focal length of lens, the measure values of D and x are 90.0 cm and

10. D2 -x2 4 D Inf- In(D2- x2) - In(4D) I d or 4D dy 1 df or or 2 90.0 0.1 7200 2 30 0.1 0.1 7200 90 -4 10-190 n=4

11. In the circuit shown in figure, the current gain, 100 for the transistor. What would be the base resistance so that VCE = 5 V? (Neglect VSE) 10 VVcc E VCE BE IE (a) 2x 103 (c) 1 106 (b) 2>< 105 (d) 500

12. and IR =5 10-3A =5 10-5 A (Using (i) 100 Thus, RgCCBE 10 V =2x 10"(2 (neglecting VBE) 5 10", A

13. An oil drop of n excess electrons is held stationary under a constant electric field E in Millikan's oil drop experiment. The density of oil is p. The radius of the drop is 11/2 3neE 2neE (d) 3nps (a) 3nelE (c) l-one 4T0Pg 4TteE

14. Let r be radius of the drop. Then the mass of the drop is 4 -volume x density tr3 Since the drop has n excesselectrons therefore it is negatively charged and the charge E on the drop is 3 n excess electrons qE mg

15. FIVE-STAR RATING! RECOMMENDED Unacademy.com/user/kumarketan ENROLL UPVOTE

16. 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

17. In the circuit shown in figure, the current gain, 100 for the transistor. What would be the base resistance so that VCE = 5 V? (Neglect VSE) 10 VVcc E VCE BE IE (a) 2x 103 (c) 1 106 (b) 2>< 105 (d) 500

18. Let r be radius of the drop. Then the mass of the drop is 4 -volume x density tr3 Since the drop has n excesselectrons therefore it is negatively charged and the charge E on the drop is 3 n excess electrons qE mg

19. Here, D distance between object plane and screen on which image is formed, f focal length of lens, x distance between two position of lens. To determine focal length of lens, the measure values of D and x are 90.0 cm and

20. FIVE-STAR RATING! RECOMMENDED Unacademy.com/user/kumarketan ENROLL UPVOTE