The electric field produced by a positively charged particle, placed in an xy-plane is 7.2 (4i + 3j) N/C at the point (3 cm, 3cm) and 100 
N/C at the point (2 cm, 0).
Text Solution
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(b, c, d)
At point (2cm, 0), field is along x-axis. It is possible only when the particle is situated on
x-axis. Its position is located by extending electric field direction from point (3cm, 3cm). The point at which this extension intersects x-axis, is the location of the charge. That is (–1cm, 0)
For point (2cm, 0), r = 3 cm, E = 100 N/C
Using, E = 
⇒ Q = 10 x 10 –12 C
Potential at origin = 
where, r = 1cm, Q = 10 x 10 –12 C
∴ V = 9V
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