A ring of radius r= 0.24 m is made of copper wire (cross-sectional area of the wire A = 0.65 x 10-6m²). The ring is placed in a uniform magnetic field whose direction is perpendicular to the page, into the page. The magnetic field increases in time according to the equation: B = 3.0t, where B is in teslas and time is in seconds. Determine the magnitude and direction of the induced current in the copper ring at room temperature (20°C) and at -200°C. Resistivity for copper is p = 1.69 × 10-8 nm and the temperature coefficient of resistivity for copper is a = 3.86 × 10¬3 хх X X X X X X X X

A ring of radius r= 0.24 m is made of copper wire (cross-sectional area of the wire A = 0.65 x 10-6m²). The ring is placed in a uniform magnetic field whose direction is perpendicular to the page, into the page. The magnetic field increases in time according to the equation: B = 3.0t, where B is in teslas and time is in seconds. Determine the magnitude and direction of the induced current in the copper ring at room temperature (20°C) and at -200°C. Resistivity for copper is p = 1.69 × 10-8 nm and the temperature coefficient of resistivity for copper is a = 3.86 × 10¬3 хх X X X X X X X X