Questions 15-16 A conducting ring of radius r and total resistance R is kept fixed on the xy-plane. Starting at time t = 0, a uniform but increasing magnetic field B(t) = at(j + k) is applied. Here a is a positive constant. 15. What is the magnitude of the current on the ring? mra 4R (b) πr² α R (c) 0 (d) 4πr² α 3R (e) 16. What is the net force on the ring? (a) 0 (b) (c) ²³a²t(i-k) 2R 27²r³a²t(-i+k) R √2πr²a R (d) 2√27²³a²t(i-k) R 8n²r³a²t(-²+3) 3R B(t)

Questions 15-16 A conducting ring of radius r and total resistance R is kept fixed on the xy-plane. Starting at time t = 0, a uniform but increasing magnetic field B(t) = at(j + k) is applied. Here a is a positive constant. 15. What is the magnitude of the current on the ring? mra 4R (b) πr² α R (c) 0 (d) 4πr² α 3R (e) 16. What is the net force on the ring? (a) 0 (b) (c) ²³a²t(i-k) 2R 27²r³a²t(-i+k) R √2πr²a R (d) 2√27²³a²t(i-k) R 8n²r³a²t(-²+3) 3R B(t)