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**This is a problem from "Concepts Of Physics" by H.C.Verma.The chapter is "Magnetic Field".**

__INTRODUCTION:__**"An electron is projected horizontally with a kinetic energy of 10 keV.A magnetic field of strength 10^-7 T exists in the vertically upward direction. Calculate the sideways deflection of the electron in travelling through 1m. Make appropriate approximations."**

__EXACT PROLEM:__**1>Travelling through 1m? which 1m? 2> how to calculate the deflection?**

__PROBLEM FACED:__**I calculated the radius using √(2Km)/qB. The particale, since it is negatively charged, will be deflected towards its left, the magnetic force acting towards its right.We have to find the deviation after it has travelled 1m, but how?**

__WHAT MY BRAIN SUGGESTED:__**I am really having problems understanding the above problem. i have just learned "magnetic field", so my concepts are still weak. Please help if you can. Thanks a lot...**

__CONCLUSION:__