Condition 2 [2]
(b) Fig.6.1 shows a uniform metre rule PQ in equilibrium.
F
10 cm
40cm
pivot
0.50N
Fig.6.1
The distance PQ is 100cm. The mass of the metre rule is 0.12 kg and its weight is W.
(1) On Fig 6.1, draw and label:
1. an arrow to show the force W acting on PQ at the centre of mass
2. an arrow to show the force R acting on PQ at the pivot.
[2]
(ii) By taking moments about the pivot, calculate F.

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r

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