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CBSE Class 12-science Answered

  A small sphere of 100mg and charge 25 microC is suspended by a thread of 1 meter length. How much horizontal electric field is required so that the thread makes an angle 30 with the vertical
Asked by Ibrahim Mohammed | 03 Mar, 2016, 01:45: PM
answered-by-expert Expert Answer
 
begin mathsize 14px style To space keep space the space charge space at space 30 degree space angle comma space the space force space exerted space by space electric space field space will space be space balanced space by space the space horizontal space component space of space weight space mg. therefore mgcos 30 equals qE therefore straight E equals fraction numerator mgcos 30 over denominator straight q end fraction therefore straight E equals fraction numerator 100 cross times 10 to the power of negative 3 end exponent cross times 9.8 cross times square root of 3 over denominator 2 cross times 25 cross times 10 to the power of negative 6 end exponent end fraction therefore straight E equals 3.4 cross times 10 to the power of 4 space straight N divided by straight C end style
Answered by Romal Bhansali | 04 Mar, 2016, 11:06: AM

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