long horizontal wire carries a current of I1 = 47.5 A. A second wire, made of 0.450 mm diameter copper wire, is 65.0 cm below the first wire and is held in suspension magnetically. The mass density of Copper is 8.93×103 kg/m3. What is the magnitude and direction of the current in the bottom wire? Give a + sign if I2 is parallel to I1, and a - sign if I2 is opposite to I1.

The two wires shown in the figure are long, straight and parallel to each other with a separation of 80 cm. The wire on the left carries a current I₁ of 5.00 A into the page. a) What must the magnitude and direction of the current I₂ be for the net field at point Q to be zero? b) What are the magnitude (in terms of the common factor μ₁/2π) and direction of the net field at point P? 80 cm P 40 cm ₁ = 7.2 A 80 cm 12 40 cm X

The sketches show possible paths of the charge after it enters a region containing a uniform magnetic field pointing into screen. Before entering the field, the charge is moving with initial speed of 15 m/s. Which path closely resembles the actual path of the charge in the field? A В v = = 15 m/s v = 15 m/§ D v = 15 m/s v = 15 m/s. A X X X X B.

A. What is the current in the current loop? B. What is the current density J in the current loop? C. To decide whether this is a large or a small current density, find the ratio of the current density J in the current loop to the current density of a 8.0 A current in a 1.6- mm diameter wire. Express your answer using two significant figures.

Two long, parallel, current-carrying wires lie in an xy-plane. The first wire lies on the line y = 0.400 m and carries a current of 25.0 A in the +x direction. The second wire lies along the x-axis. The wires exert attractive forces on each other, and the force per unit length on each wire is 290 μN/m. What is the y-value (in m) of the line in the xy-plane where the total magnetic field is zero? .207 Use the right-hand rule to determine the possible location of a point where the magnetic field is zero. Write an expression for the force of attraction between the wires, find expressions for the magnetic fields due to each wire at the point, and set them equal. Use your expression for the force per unit length to eliminate one of the currents, and solve for the required distance. m

Two long, parallel conductors, separated by 14.0 cm, carry currents in the same direction. The first wire carries a current I1 = 3.00 A, and the second carries I2 = 8.00 A. (See figure below. Assume the conductors lie in the plane of the page.) (d) What is the force per length exerted by I2 on I1?

In the figure, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 7.80 cm. Each wire carries 12.7 A, and all the currents are out of the page. What is the magnitude of the net magnetic force per unit length on wire 1? Number i Units II a 4 3