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CBSE Class 10 Answered

in a t.v a beam of electrons is emitted.the beam current is 80MA.How many electrons of t.v every second. Also find the total charge striking the screen in 2 minutes.
Asked by SURYA VAMSI | 08 Apr, 2013, 09:52: PM
answered-by-expert Expert Answer
I = 80 micro Ampere = 8 * 10-5A
t = 1 sec.
I = Q/t
   = ne/t n
     = It/e
= 8 *10-5 *1 sec divided by 1.6 * 10-19 = 5 * 1014electrons strike the screen every second.
ii. I = Q/ t
Q = It = 8 * 10-5 * 2 * 60 sec= 960 * 10-5 C
Answered by | 09 Apr, 2013, 11:53: AM

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