A high power line carries a current of 4.7 kA. What is the strength of the magnetic field this line produces at the ground, 7.25 m away? (μ0 = 4π × 10-7 T ∙ m/A). Express your answer in milliTeslas.

005 A long, thin conductor carries a current of 9.24 A. At what distance from the conductor is the magnitude of the resulting magnetic field 0.000153 T? Answer in units of cm.

What is the magnitude and direction of the acceleration on the electron in a 3T magnetic field ( -k) and an 800 V/m (-j) electric field, shown below (neglecting gravity), if its velocity is 300 m/s? X X X B= 3.0 T X X X X X X X X X X E=800 V/m 3.512 EE+13 m/s2 (j) -3.512 EE+13 m/s2 (j) 3.512 EE-13 m/s2 (k) 2.489 EE+13 (j) -2.489 EE+13 (j)

A magnetic field directed into the page changes with time according to B = 0.035 or? + 1.40, where B is in teslas and t is in seconds. The field has a circular cross section of radius R = 2.50 cm (see figure below). x x x x * * x X x x x xx x X X x x X x x x x x R x * x x x x X x x x x x Bin (a) When := 4.70 s and r = 0.020 0 m, what is the magnitude of the electric field at point P,? N/C (b) When = 4.70 s and r,= 0.020 0 m, what is the direction of the electric field at point P,? O perpendicular to r2 and clockwise O perpendicular to r, and counterclockwise into the page O out of the page

A magnetic field directed into the page changes with time according to B = 0.031 ot² + 1.40, where B is in teslas and t is in seconds. The field has a circular cross section of radius R = 2.50 cm (see figure below). xxxx vPg xxx xxx xxxx x Rx Bin P₁ (a) When t = 4.80 s and r₂ = 0.020 0 m, what is the magnitude of the electric field at point P₂? 0.00030 X Your response is off by a multiple of ten. N/C (b) When t = 4.80 s and r₂ = 0.020 0 m, what is the direction of the electric field at point P₂? perpendicular to r₂ and counterclockwise O into the page O out of the page. O perpendicular to ₂ and clockwise

5. Once more, please refer to the figure. This time the charge is 7.98 x 10^-6 C, the magnetic field strength is 2.68 T and the electric field strength is 1.70 x 10^5 N/C. The charge experiences a total force of magnitude 15.00 N as it enters the region. What is its speed as it enters the region?   1.08E+06 m/s   6.38E+05 m/s   4.47E+05 m/s   9.57E+05 m/s