An isolated charged point particle produces an electric field with magnitude E at a point 2m away. At a point 1m from the particle the magnitude of the field is:
Correct answer: C. 4E
- A. 2E
- B. 3E
- C. 4E
- D. E
Explanation
Electric field a point 2m from the is E=Kq/(2)2 and Electric field a point 1m from the is E'=Kq/(1)2. Here, K is a constant and q is the charge on the particle.E=kq/4 E'=kq.......(ii)4E=kq ......(i)Comparing equation (i) and (ii)4E=E'So, the electric filed at a point 1m from the charge is 4 time the electric field at a point 2 meters away from the charge.
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Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
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