Answer:
a

b

Explanation:
From the question we are told that
The current is 
The length of one side of the square 
The separation between the plate is 
Generally electric flux is mathematically represented as

differentiating both sides with respect to t is

=> 
Here
is the permitivity of free space with value

=> 
=> 
Generally the displacement current between the plates in A

=> 
The force (attractive if the charges are dissimilar, else repulsive) is along a line that connects the two particles.
Answer:
(a)
x=7.83 Kgm/s
y=5.48 Kgm/s
(b)
191.25 N
Explanation:
(a)
Change in momentum in x direction
where m is mass and v is the velocity and
is the angle of kick
Substituting m=0.425 Kg, v=22.5m/s and 


Change in momentum in y direction



(b)
Force exerted by the player
F=mv/t where t is time
Substituting 
F=(0.425*22.5)/0.05= 191.25 N
Answer:
D) θ₂= 36. 6º
Explanation:
In this diffraction experiment it is described by the equation
sin θ = m λ
The first dark strip occurs for m = 1 and since the angle is generally small we can approximate sine to the value of the angle
θ₁ = λ/ a
This equation is valid for linear slits, in the case of a circular slit the problem must be solved in polar coordinates, so the equation changes slightly
θ₂ = 1.22 λ / a
In the proposed exercise we start with a linear slit of width a, where tes1 = 30º and end with a circular slit of the same diameter
θ₂ = 1.22 λ / a
Let's clear (Lam/a) of equalizing the two equations
θ₁ = θ₂/ 1.22
θ₂ = 1.22 θ₁
θ₂ = 1.22 30
θ₂= 36. 6º
When reviewing the correct results is D
Answer: The clapper of an electric doorbell is an electromagnet. When the clapper of a doorbell strikes the bell, it opens an electric circuit. The electromagnet of an electric motor is connected to a permanent magnet. Only the shaft of an electric motor turns when current flows through the motor.
Explanation: hope this helped