Test 2 Name Section Physics 2 MULTIPLE CHOICE, Choose the one alternative that b

Question

Test 2 Name Section Physics 2 MULTIPLE CHOICE, Choose the one alternative that best completes the statement or answers the question. 1) A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? A) 4.9 mT B) 16 mT C) 9.0 mT D) 6.0 mT E) 15 mT 2) A proton moving with a velocity of 4.0x 104 m/s along the y-axis enters a magnetic field of 0.20 T 2) directed towards the -x-axis. What is the magnitude force acting on the proton? A) 8.0× 10-15 N B) 2.6× 10-15 N C) 3.9 x 10-15 N D) 1.3 x10-15 N E)ON 3) An electron moving along the x-axis enters a magnetic field. If the electron experiences a 3) magnetic deflection in the -y direction, what is the direction of the magnetic field in this region? A) along the +z-axis 8) along the y-axis C) along the z- axis D) along the y-axis E) along the x-axis ) A wire of a certain length is carrying a current of 2.0 A, It is placed at an angle of 60 with respect to 4) a magnetic field of strength 0.20 T. If the wire experiences a force of 0.40 N, what is the length of the wire? A) 1.4 m 8) 1.6 m C) 1.8 m D) 1.0 m E) 12 m 5) Two long parallel wires carry currents of 5.0 A and 8.0 A in the opposite direction. The wires are 5) separated by 0.30 m. Find the magnetic force per unit length between the two wires A) 7.2x 10-5 N attractive B) 2.7× 10-5 N repulsive C) 3.4x 10-5 N attractive D) 2.7 x 105 N attractive E) 7.2× 10-5 N repulsive 6) 6) A 25-m H inductor is connected in series with a 20-0 resistor through a 15-V dc power supply and C) 0.60 A 7) The inductance of a solenoid 16.0cm long with a cross-sectional area of 1.00 × 10-4 m2 is 1.00 m H. C) 1130 a switch. If the switch is closed at t-0s, what is the current when t2.0 ms? A) 0.50 A 8) 0.40 A D) 0.70 A E) 0.80 A 7) How many turns of wire does this solenoid have? A) 150 8) 159,000 D) 282 E) 318,000

Explanation / Answer

Answer 1

If the magnetic field at the center of the solenoid is say B

B = o N I / L
o:  Permeability constant = 4 x 10-7 H
N: Number of turns = 400
I : Current = 12 A
L : Length of the solenoid : 0.40 m

Substituting we get B = 4 x 10-7 * 400 * 12 / 0.40

B = 15 mT ( option E)

B =

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