Archive
9th of September 2015
Physics
Q:

in a particular rv tube,a beam of electrons is emitted.the beam current is 80 pa.how many electrons strike across the screen of tv every second?also find the total charge striking the screen in per minute

Mayank Dak - CBSE - Class X

Wednesday, September 09, 2015 at 18:30:PM

A:

begin mathsize 14px style Hi space Mayank comma Beam space current space is space straight I space equals space 80 space μA space equals space 80 cross times 10 to the power of negative 6 end exponent space straight A Hence comma space in space one space second space the space number space of space electrons space striking space will space be straight I equals straight Q divided by straight t space equals space ne divided by straight t equals ne therefore straight n equals straight I over straight e equals fraction numerator 80 cross times 10 to the power of negative 6 end exponent over denominator 1.6 cross times 10 to the power of negative 19 end exponent end fraction equals 5 cross times 10 to the power of 14 space electrons  Total space charge space per space minute space is straight Q equals It equals 80 cross times 10 to the power of negative 6 end exponent cross times 60 equals 4.8 cross times 10 to the power of negative 3 end exponent space straight C end style

Wednesday, September 09, 2015 at 18:43:PM