# Recent content by agirlsrepublic

listen buddy.. if i know that E=vB then i know where he got the equation from :rolleyes:

thanks..i appreciate it

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...
4. ### Direction of magnetic force

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 please helpppppp
5. ### The current balance- an application

does anyone know what the current balance can be used for..ie. a practical application of the current balance?
6. ### Electric potential at a point in a sphere

no its not..its an insulating sphere
7. ### Electric potential at a point in a sphere

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...