\fPHY 162 A/B Spring 2022 Exam 4 - Ch 24-25 (14th April 2022). 15. (10 points) Isolation transformers are widely used in the medical field to protect patients against electric shock, by blocking the transmission of the DC component from one circuit to another but allows AC components to pass through. These transformers are designed to change the size of ime-varying voltage. The time-dependent magnetic field in a long solenoid with cross-sectional 8 cm .08 m area of 8 cm, is represented by the equation: B = Bo sin (2nvt) where the quantity v is the frequency of the magnetic field 2 a. (5 points) What is the emf induced in a ring of radius R concentric with the axis of the solenoid at time = 30 s? V - 162 B/- Bosin ( 2nut ) B.= 12 x10 % + 12 x 10- sin / 20r ( 162) (30s ) B = - 1.076 * 10 ? T D= BAces Q (- 1,076 - 10-7 ) (.08 ) cos b. (5 points) What is the induced current in the ring? IR - VHB E = R= 10ohms = emf Redu 10