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Margaret [11]
4 years ago
14

Calculate the force needed to move a 2kg mass with an acceleration of 5ms-2

Physics
1 answer:
kap26 [50]4 years ago
7 0

Answer:

\Huge \boxed{\mathrm{10 \ N}}

Explanation:

\sf Force \ (N)=mass \ (kg) \cdot acceleration  \ (ms^{-2})

F=ma

The mass is 2 kg.

The acceleration is 5 ms⁻².

F = 2 \cdot 5

F=10

The force is 10 N.

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You would like to store 8.1 J of energy in the magnetic field of a solenoid. The solenoid has 620 circular turns of diameter 6.6
marta [7]

Answer:

(a) The current needed is 56.92 A

(b) The magnitude of the magnetic field inside the solenoid is 0.134 T

(c) The energy density inside the solenoid is 7.144 kJ/m³

Explanation:

Given;

energy stored in the magnetic field of solenoid, E = 8.1 J

number of turns of the solenoid, N = 620 turns

diameter of the solenoid, D = 6.6 cm = 0.066 m

radius of the solenoid, r = D/2 = 0.033 m

length of the solenoid, L = 33 cm = 0.33 m

Inductance of the solenoid is given as;

L= \frac{\mu_o N^2 A}{l}

where;

A is the area of the solenoid = πr² = π (0.033)² = 0.00342 m²

μ₀ is permeability of free space = 4π x 10⁻⁷ H/m

L= \frac{4\pi*10^{-7} *620^2 *0.00342}{0.33} \\\\L = 0.005 \ H

(A). How much current needed

Energy stored in magnetic field of solenoid is given as;

E = \frac{1}{2} LI^2\\\\

Where;

I is the current in the solenoid

E = \frac{1}{2} LI^2\\\\I^2 = \frac{2E}{L}\\\\I = \sqrt{\frac{2*8.1}{0.005}}\\\\ I = 56.92 \ A

(B) The magnitude of the magnetic field inside the solenoid

B = μ₀nI

where;

n is number of turns per unit length

B = μ₀(N/L)I

B = (4π x 10⁻⁷)(620/0.33)(56.92)

B = 0.134 T

(C) The energy density (energy/volume) inside the solenoid

U_B = \frac{B^2}{2\mu_0} \\\\U_B = \frac{(0.134)^2}{2*4\pi*10^{-7}} \\\\U_B = 7143.54 \ J/m^3\\\\U_B = 7.144 \ kJ/m^3

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