Electric Field & Field Lines
A thin conducting ring of radius R is given a charge +Q. The electric field at the centre O of the ring due to the charge on the part AKB of the ring is E. The electric field at the centre due to the charge on the part ACDB of the ring is
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Answer: (d)
- A complete uniformly charged ring gives zero field at its centre: .
- Charge on AKB is positive, so its field at O points away from K, i.e. along KO, with magnitude .
- Hence : magnitude , directed along OK.
- So the answer is (d) E along OK.