a velocity selector consists of magnetic and electric fields. if B= 0.015 find the value of E such that a 750 eV electron is moving along the + x- axis and is undeflected.
this is what i did..
the magnetic force=electric force so qvB=qE or vB=E
K= .5 mv^2 and r= mv/qB so k...
how do you find the direction of the magnetic force on a current loop..a loop that experiences a torque?
i know you use some kind of right hand rule but im confused
also..the direction of a charged particle in a magnetic field
im having trouble finding the electric potential at a point inside a sphere at r= 40 cm where the radius of the sphere is 50 cm and the charge Q is 12 micro C.
i know that v= kQ/r at a point on the surface and at a point outside the sphere but what to i do now that i cant use total charge...
k im really confused about how to go about setting up the intergral of Eds. how do u choose the limits of integration and how do u know whether to write Va-Vb= -(integral) E ds
or Vb-Va = - (integral) E ds
its really frustrating me
i thought i understood but i realised i really dont