295. A river is flowing at the rate of 8 km/h. A swimmer swims across the river with a velocity of 10 km/h
w. r.t. water. The resultant velocity of the man will
be in (km/h):-

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

What are the dimensions of the cross section that passes through the points a, f, g, and d?