Created by StemPy LabEach field in List I is at a distance , in the range stated. Match it with how its size depends on in List II. Charges are spread evenly unless stated. List I (P) The field on the axis of a thin ring of radius with charge , at a distance from its centre, for . (Q) The field of a straight rod of length and charge , on its perpendicular bisector at a distance , for . (R) The same field of the rod, for . (S) The field on the axis of a thin ring of radius , one half charged and the other half , at a distance from its centre, for . List II (1) grows as ; (2) does not depend on ; (3) falls as ; (4) falls as ; (5) falls as . Which matching is correct?
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← A small electric dipole is made of charges of +4.0 nC and -4.0 nC, held 1.0 mm apart. Its dipole moment p points from the negative charge to the positive one. A point charge of +6.0 nC is held 20 cm from the centre of the dipole, on the line through the centre at right angles to p, as in the figure. The size of the dipole is tiny compared with this distance. Both are in empty space. Take 1/4πε₀ = 9.0 × 10⁹ N m² C⁻². What force does the point charge exert on the dipole?A solid insulating sphere of radius 10 cm, centre O, carries a uniform charge density of +3.0 µC/m³. A spherical cavity of radius 4.0 cm has been cut out of it. The centre O' of the cavity is 5.0 cm from O, so O itself lies in the charged material, as in the figure. The cavity is empty, and nothing else is nearby. The material itself does not change the field, so treat the charge as if it sat in empty space. Take ε₀ = 8.85 × 10⁻¹² C² N⁻¹ m⁻². Which of the following statements are correct? →
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