Question

One billion electrons pass from a point A to B in a conductor in 10 -4 seconds .What is the magnitude and direction of current?

Answer 1

Answer:

) Speed of box (u)=0.35m/s

Coefficient of kinetic friction (μk)=0.12

Frictional Force (F)=?

We have,

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μk=FkR ⇒ Fk=μkR=μkm.g

Now,

Fu=F+Fk [∵ for Uniform Motion, a=0]

Fu=m.a+Fk=μkm.g=0.12∗6∗10=7.2N

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(ii) When the box moves with acceleration 0.18m/s2. Then

Fu=m.a+mkm/g=6∗0.18+0.12∗6∗10=8.28N