cm. The magnetic field is unifor
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. A uniform magnetic field is directed normal to the plane of a wire that has been formed into 6
a circular ring of radius, r = 3.1 cm. The magnetic field is uniform in space, but changes
with time. The resistance of this ring is R = 2.0 Ω. A steady current of i = 2.5 mA flows
through the wire. How fast is the magnetic field changing?

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- The figure below shows the cross section of a long cylindrical conducting cylinder of radius a = 0.0896 m. The current density in the cross section is given by J = (7.66 × 106 A/m³) r. Where inside the cylinder does the magnetic field have a magnitude of 1.08 × 10-³ T? i m a rThe figure below shows the cross section of a long cylindrical conducting cylinder of radius a = 0.0878 m. The current density in the cross section is given by J = (4.13 × 106 A/m³) r. What is the magnitude of the magnetic field at a distance of 0.0535 m from the center of the cylinder? i T a rA. 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.
- 6. A wire with length L carries a constant current of I in the +y direction. See figure. It is in a region of space where the magnetic field is given by: B=-B, y (4) L positive constant. If the magnitude of the magnetic force on the wire is F, find Bo. The knowns are F, I and L. Start with dF = Idl x B I i, where Bo is a thickness = dy I LThe small currents in axons corresponding to nerve impulses produce measurable magneticfields. A typical axion carries a peak current of 0. 040 μA. What is the strength of the field at a distanceof 0.9 mm?A rectangular wire loop with a length of 3.5 m and a width of 0.2 m carries a clockwise current of 32.4 A. An infinitely long wire carrying current 89.6 A from left to right lies nearby. At its closest point, the loop is a distance 0.16 m from the wire. W What is the force acting on the loop in Newtons? Use a positive number for an attractive force (loop moves toward wire) and a negative number for a repulsive force (loop moves away from wire).