Ten charges are placed on the circumference of a circle of radius R with constant angular separation between successive charges. Alternate charges 1 , 3 , 5 , 7 , 9 have charge ( + q ) each, while 2 ,

Question

Ten charges are placed on the circumference of a circle of radius R with constant angular separation between successive charges. Alternate charges $1, 3, 5, 7, 9$ have charge $(+ q)$ each, while $2, 4, 6, 8, 10$ have charge $(- q)$ each. The potential V and the electric field E at the centre of the circle are respectively : (Take $V = 0$ at infinity)

Question diagram: Ten charges are placed on the circumference of a circle of r

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Answer:

C

Solution:

$v_{net} = 5 (\frac{kq}{R}) + (\frac{5 k (- q)}{R})$
$v_{net} = 0, [Q_{net} = 0]$
$E_{net} = 0$ , by symmetry

TestHub · Accepted Answer

v net = 5 kq R + 5 k ( - q ) R v net = 0 , Q net = 0 E net = 0 , by symmetry

Physics - Elecrostatics Question with Solution | TestHub

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