Question

pls help me with the question no.2and 5

Answer 1

Hi ....dear.....
here is your answer..!!!
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The electric field inside a spherical shell is zero. Therefore, force on the charge placed at the centre of the shell is zero.and the charge which is placed as surface behaves like entire charge is placed at centre.......
...So total charge =20+10=30uC...
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electric field at distance 20cm E= K*30*10^-6/0.2*0.2.
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.E = see picture.......
.Next question.....
Ans. The current in two parallel , strength and placed at 1 m distance in vaccum ,when flows applies a force on wire of 2*10^-7 Newton on per unit length is defined as 1 ampere!!

..hope this helps you .!!
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