Compute the self-inductance of a toroid of square cross section if it is wound with 200 turns. the inner and the outer radii of the toroid are 20 cm and 25 cm, respectively. the relative permeability of the mag netic material is 500. if the current in the coil varies sinusoidally as 2 sin 314r a, determine the induced emf in the coil

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Which missing item would complete this alpha decay reaction ? > 228/88ra + 4/2he a.224/96 rn b. 232/90 th c. 230/92 u d. 235/92 u

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?