A ring of radius R=61 cm carries a charge of Q=+610 nC uniformly distributed over it.  A point charge q is place at the center of the ring, as shown.  The electric field is equal to zero at the point P which is on the axis of the ring and a distance d=25 cm from its center.  What must be the charge q in nC?

The electric field in an xy plane produced by a positively charged particle is 8.29(5.9 i + 5.3 Ĵĵ) N/C at the point (4.2, 4.0) cm and 100 î N/C at the point (4.6, 0) cm. What are the (a) x and (b) y coordinates of the particle? (c) What is the charge of the particle? (a) Number i Units (b) Number i Units (c) Number i Units

A charge of 20 nC is uniformly distributed along a straight rod of length 4.0 m that is bent into a circular arc with a radius of 2.0 m. What is the magnitude of the electric field at the center of curvature of the arc?

3.00 nC of charge is uniformly distributed along a thin rod of length L = 1.80 cm as shown in the figure. What is the magnitude of the electric field at point P, a distance r = 20.8 cm from the centre of the rod?

A solid insulating sphere of radius 0.06 cm carries a total charge of 30 nC. Concentric with this sphere is a conducting spherical shell with an inner radius of 0.13 cm and an outer radius of 0.17 cm and carrying a total charge of -15 nC. Find the charge distribution for the outer surface of the conducting spherical shell. O 4.130 m2 4 C 4.130x10 m2 -5 C 4.130x10 m2 -8 C 4.130x10 m2

The charge density of a non-uniformly charged sphere of radius 1.0 m is given as: For rs1.0 m; p(r)= 2po(1-2 r/3) For r>1.0 m; p(r)= 0, where r is in meters. What is the value of r in meters for which the electric field is maximum? 0.25 0.50 0.75 1.0 2.0

What is the percent difference between the electric field produced by the finite disk and by an infinite sheet with the same charge per unit area at x = 0.40 cm?

5.10 nC of charge is uniformly distributed along a thin rod of length L = 2.00 cm as shown in the figure. What is the magnitude of the electric field at point P, a distance r = 7.90 cm from the centre of the rod?

P 2R R The center of the charged circle of radius R = 70cm in the x-z plane is coincident with the origin of the coordinate system in the figure. The total charge Q on the circle is not uniform, but is distributed according to the relation 1 = v50. Where 0 is the angle between the radius R of the circle and the +x-axis in radian. Find the magnitude of the Electric field due to these charges in the y-axis direction only, at the point P at a distance of 2R. k. 47E,' Eo = 9x10-12 () and n = 3 c2 Wm2 1013 a) 15 10 13 b) 45 1013 1013 d) 105 e) ) 1013 75 135

A uniformly-charged wire of total charge Q, and total length L=6.4 m is placed as shown in the figure, where the left end is at a distance a=0.1 m from the origin. Another point charge Q is placed at the right end of the wire. If E1 and E2 are the magnitudes of the electric field at the origin by the wire and by the charge, respectively, then find the ratio E1/E2.