Alength of copper wire carries a current of 15 a, uniformly distributed through its cross section. calculate the energy density of (a) the magnetic field and (b) the electric field at the surface of the wire. the wire diameter is 2.6 mm, and its resistance per unit length is 4.5 ω/km.

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2