An infinite straight wire with radius r carries a current i uniformly distributed over its cross section. the magnetic field at a distance d from the axis of the wire is b. what is the magnetic field a distance 2d from the axis of the wire? both points are inside (2d < r) the wire.(a) both fields are zero.(b) b(c) b/2(d) 2b(e) b/4(f) 4b

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed