Answer:
The force per unit length is
Explanation:
The current carrying by each wires = 2.85 A
The current in both wires flows in same direction.
The gap between the wires = 6.10 cm
Now we will use the below expression for the force per unit length. Moreover, before using the below formula we have to change the unit centimetre into meter. So, we just divide the centimetre with 100.
Answer:
Eddy currents
Explanation:
When a magnetic flux linked across the coil changes, an induced emf is developed in the coil and hence the induced current is also developed in the coil.
If the induced current in the large conductor, the current is called eddy current. It produces the heating effect.
There are several applications of the eddy current.
(1) Electromagnetic brakes
(2) Induction furnace, etc.
To minimize the effect of eddy current we use choke coils, in which the core is made of laminated thin sheets.
Answer:
(a) 2.734 J
(b) 3.881 J
(c) 1.42
Explanation:
Kinetic Energy: This is the energy a body posses due to motion. The unit of kinetic energy is Joules (J). It can be expressed mathematically as
K = 1/2mv².............................................. Equation 1
Where K = kinetic energy, m = mass, v = velocity.
(a) Given: m₁ = 3.1 g, = 0.0031 kg, v = 42.0 m/s.
Substituting into equation one above,
K₁ = 1/2(0.0031)(42)²
K₁ = 2.734 J
Thus Kinetic Energy of the first bullet = 2.734 J
(b) Given: m₂ = 4.4 g = 0.0044 kg, v = 42 m/s.
Substituting into equation one above,
K₂ = 1/2(0.0044)(42)²
K₂ = 3.881 J
Thus Kinetic energy of the second bullet = 3.881 J
(c) K₂/K₁ = 3.881/2.734
K₂/K₁ = 1.42
Answer:
5.3 m
Explanation:
Your friend is 1800 mm tall, and you want them to fill half the frame (79 mm / 2 = 39.5 mm).
The film is 116 mm behind the lens. Using similar triangles:
x / 1800 = 116 / 39.5
x = 5286
Rounded to two significant figures, your friend should stand 5.3 meters away.