Which will produce a magnetic field? any wire with or without a current a wire formed into a coil a wire carrying a current a wire formed into a single loop

A wire carrying a current

A wire carrying a current will produce a magnetic field.

A wire carrying electric current will produce a magnetic field with closed field lines surrounding the wire.

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft