A straight wire aligned with the z axis carries an alternating current I=I_cos (2лft). In this case, the magnetic field around the wire at a radius r away from the wire is given by: 0 O a. O b. O C. μ B = sin (2лft) 9 2лr º 0 1 B = I cos (2лft) 9 2лr 0 O d. 1 B = I cos (2лft) r 2лr о 9 μ BI cos (2лft) 2лr

A wire carries a current I1= 2 A to the right. A distance d=3cm above the wire is the bottom edge of a loop of radius r=10 cm. The loop also carries a current I2= 4 A clockwise around the loop. What is the magnitude of the magnetic field at the center of the loop? a) 4.9 x10 ^-6 T b) 2.2 x 10^-5 T c) 3.5 x10^-5 T

I1 a O12 Two long, straight wires carry currents in the directions shown in the figure above. 1 = 2 A, 12 = 10 A, a = 8 cm, b = 2 cm. a) Find the magnetic field strength at point P. i+ -0.46*10^-5 B = ( 2.84*1^-5 j)T b) What force would 1 m of a third wire, carry a 4-A current out of the page, experience if place at P? F = ( 1.84*10^-5 i+ 11.36*10^-6 j)N

A very long wire bears a current of 0.50 A. What is the magnitude of the magnetic field 0.35 meters from the wire? Recall that in the case of an infinitely long straight wire, that the magnetic field strength is: Họi B (1) 2ar О А. 2.9 х 10-3т В. 2.9 х 10-5 Т C. 2.9 × 10-7 T D. 2.9 x 10-9 T