(1) directed to the right
Explanation:
To the right of B, u(x) is a decreasing function & so its derivative is negative,this implies that the x component of the force on a particle at this position is positive,or that the force is directed towards right .Small deviations from equilibrium at point B causes a force to accelerate the particle away ,hence particle is in <u>unstable equilibrium.</u>
10 ( 6+6 ) = 120
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Answer:
(a) 1133J/m
(b) 5.714m²
Explanation:
(a) u = 1/2×εE²
εo = 8.85×10-¹² F/m
E = 0.8 × 2.0×10⁷V/m = 1.6×10⁷V/m
u = 1/2×8.85×10-¹² × (1.6×10⁷)²= 1132.8J/m
(b)
U = 1/2CV² = 1/2(Aεo/d)×V²
U = 1/2(Aεo/d)×V²
U = 200mJ = 200×10-³
d = V/E = 500/ (1.6×10⁷) =3.13×10-⁵m
200×10-³ = 0.5×A×8.85×10-¹²×500²/3.13×10-⁵
200×10-³ = 0.035A
A = 200×10-³/ 0.035 = 5.714m².
