Ten charges are placed on the circumference of a circle of the radius with constant angular separation between successive charges. Alternate charges , , , , have charge (+q) each, while , , , , have charge (–q) each. The potential and the electric field at the center of the circle are respectively: (Take at infinity)
Explanation:
Potential :
Step 1.Given data:
Step 2. Explanation:
Electric field :
Step 1.Given data:
Charges placed on positions one and six will form a vector as shown in the above figure.
Charges placed on positions two and seven will form a vector as shown in the above figure.
Charges placed on positions three and eight will form a vector as shown in the above figure.
Charges placed on positions four and nine will form a vector as shown in the above figure.
Charges placed on positions five and ten will form a vector as shown in the above figure.
Thus, the combined figure will look like the below shown figure:
Step 2. Explanation:
Hence option A is the correct option.