# E3F09 - Physics 227 Final Exam 18 December 2009 Profs Rabe...

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1. The resonant frequency of a certain LC circuit is 6 × 10 5 Hz. If the capacitance is then doubled and the inductance is tripled, what will be the new resonant frequency? a) 1 . 47 × 10 5 Hz b) 1 × 10 5 Hz c) 6 × 10 5 Hz d) 2 . 45 × 10 5 Hz e) 3 . 60 × 10 5 Hz 2. A bar magnet with its north end down is dropped through a cir- cular loop of wire from far above. Magnetic field lines leave the magnet through its north end and enter the magnet through its south end. Seen from above, the direction of the current induced in the loop will a) first be counterclockwise and later clock- wise. b) always be clockwise. c) first be clockwise and later counterclock- wise. d) always be counterclockwise. e) none of these. S N 3. The electric field in a cir- cular parallel plate capaci- tor is increasing at a uni- form rate, rising 36 V/m in one microsecond. If the ra- dius of the capacitor is 10 cm, what is the magnitude of the magnetic field at the outer rim of the capacitor?
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