Answer:
Explanation:
Energy stored in a capacitor
= 1/2 C₁V²
capacity of a capacitor
c = εK A / d
k is dielectric and d is distance between plates .
When the distance between the plates is halved and then filled with a dielectric (κ = 4.3)
capacity becomes 4.3 x 2 times
New capacity
C₂ = 8.6 C₁
Energy of modified capacitor
1/2 C₂ V²= 1/2 x 8.6 c x V²
Energy becomes
8.6 times.
Energy stored = 8.6 x 10⁻⁴ J
Answer:
gravity pulled in clouds of dust and gas. which is sometimes referred to as a nebula.
Explanation:
In radio communication, "amplitude modulation" refers to encoding a wave with information by adjusting the height (amplitude) of the waves. <em>(a)</em>
Answer:
12 cm
Explanation:
We shall use Lens makers formula here which is as follows

Put μ = 1.5 , R₁ = 10 cm ,R₂ = - 15 cm ( according to sign convention )

= .5 x ( 15 + 10 ) / 15 x 10
= 
F = 12 cm
Answer:
angular frequency of the table must be same as the frequency of the projection of the gum on the wall
Explanation:
Since we know that the projection on the wall is the vertical component of the position of the gum on the rotating table
So here we will say

so the angle made by the radius vector depends on the angular frequency of the disc by which it is rotating
So we can say

so here we can say

so here we can say that
angular frequency of the table must be same as the frequency of the projection of the gum on the wall