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# img057 - 77777 12 13 14 15 A current I through an...

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Unformatted text preview: 77777 12. 13. 14. 15. A current I through an inﬁnitely long wire increases. A square loop made of a conductor is placed next to the wire carrying the current as shown (the loop and the wire are in the plane of the sheet). What is the direction, with respect to the page, of a net force exerted on the loop? @down (2) up (3) out of the page A square, singletum wire loop, 1 cm on a side, is placed inside a solenoid that has a circular cross section ofradius of3 cm, as shown. The solenoid is 20 cm long and wound with 1000 turns of wire carrying a current of 3 A. If the current in the solenoid is reduced to zero in 0.3 5, ﬁnd the magnitude of the average induced emf in the square loop. . (1) 6.3 pV (2) 7.2 [IV (3) 9.6 pV A 25-turn circular coil of wire has a diameter of 1 m. It is placed with its axis parallel to the Earth’s / (4) into the page R Q (5) zero cm lulu ion (4) 8.4 “V (5) 10.5 ”V 77777 magnetic ﬁeld of 50 pT. Then, the coil is ﬂipped 180° (its axis is reversed) in 0.2 3. An average emf of what magnitude is generated in the coil? (1) 9.8 mV (2) 4.9 mV (3) 3.9 mV A conducting bar can move along the conducting rails sepa— rated by a distance I = 1.2 m. The rails are interconneCted via a resistor R = 69. A uniform magnetic ﬁeld of 2.5 T is directed into the page. At what speed should the bar be moved to produce a power dissipation of 1.5 W in the resistor. (1) 1.0 m/s (2) 2.0 m/s (3) 3.0 m/s (4) 8.6 mV (5) 7.1 mV ...
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