Question 343: Electrostatics & Capacitance

Question

Two point charges A and B of magnitude +8 $$	imes$$ 10
$$-$$6
C and $$-$$8 $$	imes$$ 10
$$-$$6
C respectively are placed at a distance d apart. The electric field at the middle point O between the charges is 6.4 $$	imes$$ 10
4
NC
$$-$$1
. The distance 'd' between the point charges A and B is :

Accepted Answer

Electric field at P will be
$$E = {{kq} \over {{{(d/2)}^2}}} 	imes 2 = {{8kq} \over {{d^2}}}$$
So, $${{8 	imes 9 	imes {{10}^9} 	imes 8 	imes {{10}^{ - 6}}} \over {{d^2}}} = 6.4 	imes {10^4}$$
So, $$d = 3$$ m

Answer

2.0 m

Answer

3.0 m

Answer

1.0 m

Answer

4.0 m

Electrostatics & Capacitance

Two point charges A and B of magnitude +8 $\times 10 -6 C and -8 \times 10 -6 C respectively are placed at a distance d apart. The electric field at the middle point O between the charges is 6.4 \times 10 4 NC -$1 . The distance 'd' between the point charges A and B is :

Choose the correct answer: