लॉरेंज बल ( Lorentz Force) | गतिमान आवेश और चुंबकत्व | 12th |Physics | Chapter 4 | Lec 5 | Gopal Sir

Class 12 Physics (Hindi) | Chapter 4 गतिमान आवेश एवं चुम्बकत्व | Important Questions and Quick Revision

The average of twelve numbers is 55.5. The average of the first four numbers is 53.4 and that of the next four numbers is 54.6. The 10th number is greater than the 9th number by 3 but lesser than the 11th and 12th numbers by 2 and 3, respectively. What is the average of the 10th and the 12th numbers? बारह संख्याओं का औसत 55.5 है | पहली चार संख्याओं का औसत 53.4 है तथा अगली चार संख्याओं का औसत 54.6 है | 10वीं संख्या 9वीं संख्या से 3 अधिक है लेकिन 11वीं और 12वीं संख्याओं से क्रमशः 2 और 3 कम है | 10वीं और 12वीं संख्याओं का औसत ज्ञात करें |

Solve the following crossword using the given clues: ACROSS 3. Principle relating to the apparent weight of a body when immersed in water. 6. Pressure caused by the weight of the air 7. Forces that require physical contact between objects 10. The force that exists between two magnets. 11. Unit of force 12. The resistance to movement that occurs when two bodies are in contact 13. The state when aperson does not feel any sensation of weight. DOWN 1. The pull of the earth 2. SI unit of pressure 4. Measure of the amount of matter in a physical body 5. The upward force that a fluid exerts on an object that is immersed in the fluid. 8. The force with which the earth pulls a body towards its centre. 9. Something that tends to cause movement of a body.

There is a concept that if unit of a physical quantity is large then the multiplier of the unit becomes less while expressing any fixed magnitude. If in a new system of unit, unit of time is 0.5 second and the unit of length is 4 metre. Answer the following questions. If unit of time is doubled, the unit of length is halved and unit of mass is increased by a factor n such that a particular force retains its value in both th system of units then the value of n is :

On 31st March, 2019 the Cash Book of Gopal disclosed a balance of ₹12,580. On checkin entries in the Cash Book with the statement, it was ascertained that : (i) Cheques amounting to ₹18,000 were drawn on 25th March, of which cheques of ₹4,800 were cashhed before 31st March. (ii) Cheques for ₹18,000 were sent for collection out of which cheques for ₹8,200 wre credited by bank after 31st March. (iii) An mamount of ₹5,000 paid directly into the merchant's accounte by a customer was not entered in the Cash Book. (iv) On 31st March, cash was deposited into the bank ₹12,720 but the cashier debited the bank account with ₹12,270 by mistake. (v) Dividend collected by bank out behalf ₹570 does not appear in the Cash Book. (vi) ₹300 is entered in the bank statement as bank charges. This was recorded as ₹200 in thecash book. You are required : (i) to prepare the Amended Cash Book, and (ii) then prepare a Bank Reconcilitaion Statement.