Two long straight wires are parallel and 12 cm apart. They are to carry equal currents such that the magnetic field at a point halfway between them has magnitude 430 μT. (a) Should the currents be in the same or opposite directions? (b) How much current is needed? (a) opposite (b) Number i 6.5 Units A ✰

A circular coil of 216 turns has a radius of 2.29 cm. (a) Calculate the current that results in a magnetic dipole moment of magnitude 2.64 A·m2. (b) Find the maximum magnitude of the torque that the coil, carrying this current, can experience in a uniform 52.5 mT magnetic field. (a) Number Units (b) Number i Units

Consider the situation depicted below, where three closely spaced wires are carrying currents of magnitudes i = 1.2 mA, i2 = 4.1 mA and iz = 1.9 mA, with directions either into the page or out of the page, as indicated in the figure. In one of the points the magnetic field is measured to be B = (-9.2î + 4.6j) (units μΤ) In which of the points indicated in the figure was this magnetic field measured?

A solenoid in your car is 36 cm long and has a diameter of 7.9 cm. It is made of copper wire with a radius of 0.50 mm. The turns are closely packed and form a single layer. Assume the resistivity of copper is 1.68 ✕ 10−8 Ω · m. (a) When the solenoid is connected to your battery with E  = 11.6 V, what is the magnetic field inside the solenoid? (Enter the magnitude.)  T

A five-sided object, whose dimensions are shown in the drawing, is placed in a uniform magnetic field. The magnetic field has a magnitude of 0.30 T and points along the positive y direction. Determine the magnetic flux through each of the five sides.

= The figure shows a solid metal object moving through a uniform magnetic field given by B (7.00 x 10-2T) k. The motion creates a potential difference of 1.30 x 103 V across the object, with the (unseen) bottom face negatively charged. What is the speed (m/s) of the object? d₁=5.00 x 102 m, d2= 3.00 x 102 m, d3 = 2.00 × 10² m. A do ds

The force on a wire is a maximum of 4.38 N when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the current is turned on. If the pole faces have a diameter of 12.9 cm, estimate the current in the wire if the field is 0.184 T. If the wire is tipped so that it now makes an angle of 15.1° with the horizontal, what force will it now feel?

A current of strength I=1A flows through the copper wire. The wire consists of two straight parts between points A(1,2,3)cm and B(1,3,2)cm and between points B and C(2,1,3)cm. The wire is located in a homogeneous magnetic field of induction B=1T. a) If the total force on the wire is 0, calculate the direction of the magnetic field. b) If we rotate the direction of the magnetic field so that the total force on the wire is the largest, calculate the maximum possible force on the wire.