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CBSE Class 12-science Answered

Find the total momentum of electrons in a straight wire of length 1000m carrying a current of 70 amperes.ans-.4 * 10-6 Newton . second
 
Asked by PratibhaPandey | 20 Jul, 2014, 08:50: AM
answered-by-expert Expert Answer

W e space k n o w space t h a t space I space equals space n e A v subscript d H e r e space V subscript d space i s space t h e space d r i f t space v e l o c i t y space a n d space n space i s space t h e space n o. space o f space e l e c t r o n s. T o t a l space n o. space o f space e l e c t r o n s space N space equals space n A l T o t a l space m o m e n t u m space left parenthesis P right parenthesis space o f space e l e c t r o n space equals space N m v subscript d o r comma space P space equals space left parenthesis n A l m right parenthesis space open parentheses fraction numerator I over denominator n e A end fraction close parentheses equals open parentheses fraction numerator I l m over denominator e end fraction close parentheses rightwards double arrow P space equals space fraction numerator 70 space x space 1000 space x space 9.3 space x space 10 to the power of minus 31 end exponent over denominator 1.6 space x space 10 to the power of minus 19 end exponent end fraction rightwards double arrow P space equals space 0.40 space mu space N s

Answered by Sheetal Jalan | 20 Jul, 2014, 09:52: PM

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