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- Unreasonable results Frustrated by the small Hall voltage obtained in blood flow measurements, a medical physicist decides to increase the applied magnetic field strength to get a 0.500-V output for blood moving at 30.0 cm/s in a 1.50-cm-diameter vessel. (a) What magnetic field strength is needed? (b) What is unreasonable about this result? (C) Which premise is responsible?Two wires are parallel, with one directly above the other, 9 cm apart. Each wire has aweight per unit length of 1.00 x 10-4 N/m. Assume the wires carry currents that are equalin magnitude. a. Find the current in the wires if the upper wire is floating (balanced) above the lowerwire b.What can you tell about the directions of the current in the two wires?Pr3. A long, cylindrical wire has the cross-section of an annulus, i.e. region between two concentric circles, see the shaded area in figure a). The outer radius of the wire is 2R, the inner diameter is R. Current I flows along the wire (perpendicularly into the page) in uniform distribution between radii R and 2R. a) b) ×I R R P 2R 2R a) Find and plot the magnitude of the magnetic field as a function of distance r from the symmetry axis of the wire. b) Suppose now that the cavity of radius R is not coaxial with the outer surface of the wire, as seen in figure b). Find the magnetic field at point P located in the center of the cavity. The current distribution in the wire is assumed to be uniform, the value of current is I.
- A square loop of aluminum wire is 17.0 cm on a side. It is to carry 12.2 Aand rotate in a uniform 1.24 Tmagnetic field as shown in the figure.(Figure 1) a.Determine the minimum diameter of the wire so that it will not fracture from tension or shear. Assume a safety factor of 10. b.What is the resistance of a single loop of this wire?A6. A 2 cm*2 cm square loop with resistance of 0.02 2 has one edge of the loop parallel to a long straight wire. The new edge of the loop is 1 cm from the wire. If the current in the sire is increasing at 50 A/s. What is the current in the loop?a.Find H in rectangular components at P(3,4,2) If there is a current filament on the z axis carrying 5 mA in the az direction. b. Repeat if the filament is located at x = -1, y = 2. (c) c. Find H if both filaments are present.
- A2.10 cm x 2.10 cm square loop of wire with resistance 1.00×10-2 has one edge parallel to a long straight wire. The near edge of the loop is 1.10 cm from the wire. The current in the wire is increasing at the rate of 120 A/s.Question #1. Consider a current-carrying circular wire with radius r. Find the angle between the infinitesimal length dl and some distance h? +z dl h dB +y y Current-carrying circular wire Note: radius r is perpendicular to the screen Select one: O 90° O 0° O 180° O 270°A solenoid is 50 cm long, has a cross section area of 10 sq.cm., an iron core (relative permeability 500), and 300 turns through which a current of 1.5 ampere flows. Find the (a) field density and (b) flux density. *
- Pr1. The figure shows the cross-section of a long, straight, cylindrical coil (solenoid) of radius r = 10 cm. The number of turns per unit length is n = 500 m-1. A direct current I = 1,0 A flows clockwise in the solenoid. A charged particle accelerated by a voltage 1000 V enters into the solenoid through a gap between the coils at point A. The velocity of the particle at point A is pointing along the radius. The particle is traveling inside the solenoid in a plane perpendicular to its axis and exits at point C at an angle a = 60° to its initial direction. 60 Av a) Determine the sign of the charge of the particle. b) What is the radius of the particle's trajectory? c) Find the charge-to-mass (Q/m) ratio of the particle. (The magnetic permeability of vacuum is µo = 47 - 10-7 Vs/Am.)Two parallel wires separated by 4.00 cm repel each other with a force per unit length of 2x10-4 N/m. The current in one wire is 5.00 A.a. Find the current in the other wire.b. Are the currents in the same or opposite direction? c. What would happen if the direction of one current were reversed and doubled?2. The electromagnet below has a current of 2.5 A and 500 turns and a length of 15 cm. (The picture shows the correct direction of current, but does not represent the number of turns.) It has an iron core, that we need to find and use the permeability of iron and not μ in any equations. The wire next to it carries a current of 7.5 A and is 5.75 cm away. The wire is centered on the face of the electromagnet. Find the force per unit length of the magnet on the wire.