Assuming a current is flowing, what increases the strength of the magnetic field of a coiled electrical wire? straightening the wire
changing the direction of the current flow
adding more coils to the wire
stopping the current

Alarge box of mass m is pulled across a horizontal frictionless surface by a horizontal rope with tension t. a small box of mass m sits on top of the large box. the coefficients of static and

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

Which component of the earth’s atmosphere is decreased due to photosynthesis?