1. A wire 10 cm long carries 2 amperes of current through an area with a magneti
ID: 1319490 • Letter: 1
Question
1. A wire 10 cm long carries 2 amperes of current through an area with a magnetic field of strength of 0.5 T. Which of the following would result in a force on the wire toward the left edge of the paper?
a. Decrease the magnetic field b. Double the current c. Reverse the direction of the current d. Reverse the direction of the field e. None of these
2. A solenoid consists of 500 turns of wire wrapped on a tube 5 cm long and 1 cm in diameter. You run 1 Ampere of current through the solenoid and measure the magnetic field. If you run the same current through it, which of the following coils would you expect to have a stronger magnetic field?
a. 500 turns on a 3 cm long, 1 cm diameter tube b. 1000 turns on a 10 cm long, 0.5 cm diameter tube c. 500 turns on a 5 cm long, 0.5 cm diameter tube d. 300 turns on a 3 cm long, 1 cm diameter tube e. 500 turns on a 5 cm long, 2 cm diameter tube
3. A loop of wire rests on this page as pictured at right. A bar magnet with its north pole toward the page is at rest 10 cm above the page. In order to induce a clockwise current in the loop, you could:
a. Move the magnet up (away from the paper) b. Move the magnet down (toward the paper) c. Lift the loop up (toward the magnet) d. either b or c e. none of these
4. Find the inductance of a coil 15 cm long with a radius of 1.2 cm which has 1200 turns of wire over its length. a) 5.4 mH b) 14 mH c) 81 mH d) 0.96 H e) This cannot be determined without the field 5. In an RLC circuit driven at very high frequencies, which of these is correct?
a. Capacitors and inductors both act like wires b. Capacitors act like open switches and inductors act like wires c. Capacitors and inductors both act like open switches d. Inductors act like open switches and capacitors act like wires e. Capacitors and Inductors both act like large resistors I B
please explain
Explanation / Answer
1. c. Reverse the direction of the current
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2. as magnetic due to Solonoid is B = uo Ni/L
to have stronger magnetic filed, it must have large turns and less length
i.e N/L is greater
so here answer wud be = option A = a. 500 turns on a 3 cm long, 1 cm diameter tube
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3. a. Move the magnet up (away from the paper)
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4. Inductance L = uo N^2 A/L
L = 4*3.14 e -7 * 1200*1200* 3.14*0.012*0.012/(0.15)
L = 5.4 mH , option A it is
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b. Capacitors act like open switches and inductors act like wires
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