Consider a point source emitting 10^12 neutrons/s in a vacuum. Calculate the flux and the current at a distance of 1 m from the source.

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Flux is the amount of particles per second per unit area.
Since we have a point source, we can assume that the neutrons are emitted isotropically,
That is, their density on a spherical shell around the source is constant.

The surface area of a spherical shell is:

S = 4(pi)r^2

And in our case r = lm, ...

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If the current in the loop of the attachment were halved, the total flux threading the loop would:
1) Halve
2) Be reduced to 1/4 of the previous value
3) Decrease to 3/4 of its original value
4) Decrease by more than 1/2 but greater than 1/4 its previous value.

The current in the long straight wire AB of the figure is upward and is increasing steadily at a rate of di/dt.
1. what is the total flux in through the loop?
2. what is the induced emf in the loop?

See the attached file.
Three loops of wire are located near a long straight current-carrying wire, as shown in the attachment. Indicate below the direction of the induced current in the specified loop, depending on the action described relating to the current in the wire or the motion of the loops. Please explain your answer.

Determine the magnetic flux density at the center of a solenoid of length 20 cm and diameter 50 cm if it is uniformly wound with 1200 turns of wire carrying a current of 3A?

A magnetic circuit consists of an iron core of a cross sectional area of 4cm^2 in which an air gap is cut in, where a flux density of 0.9T is required. There is a leakage factor of 1.2 and fringing increases the cross sectional area of the gap by 10%.
What should be the flux density in the iron?

The magnetic flux threading a metal ring varies with time t according to 3at^3-bt^2, with a = 7.7s^-3m^2T, and b = 2.8 s^-2m^2T. The resistance of the ring is 2.3 Ohms. Determine the maximum current induced in the ring during the interval from t1 = -2.3 s to t2 = 7.3 s. Answer in units of A

See attached file.
In the figure, ABCD is a conducting wire. A conducting bar EF is laid on top of the wire and slid toward BC with a speed of .030 m/sec. A constant magnetic field B of 2.0*10^(-5)Tesla points out of the paper. The length of BC is 1.5m and the distance of the bar from EF is initially 2.0m.
1) What is the i

Consider the space region bounded below by the right angled cone z=sqrt(x^2+y^2), and above by the sphere
x^2+y^2+z^2=2.
These two surfaces intersect in a horizontal circle, let T be the horizontal disk having this circle as boundary, S the spherical cap forming the upper surface, and U the cone forming the lower surface.