Positive point charges q = 9.00 µC and q' = 2.00 µC are moving relative to an observer at point P, as shown in the figure (Figure 1). The distance d is 0.130 m, v = 4.60x10° m/s, and v' = 9.20x10° m/s. Part A When the two charges are at the locations shown in the figure, what is the magnitude of the net magnetic field they produce at point P? B=

The uniform 30.0 mT magnetic field in the figure points in the positive z-direction. An electron enters the region of magnetic field with a speed of 5.50 x 106 m/s and at an angle of 30° above the xy-plane. (Figure 1) Figure X Z 000 30° 12 1 of 1 Part A Find the radius r of the electron's spiral trajectory. Express your answer with the appropriate units. I JA Value Submit Part B DO Request Answer Find the pitch p of the electron's spiral trajectory. Express your answer with the appropriate units. μÅ Value Units Submit Request Answer Return to Assignment Units www ? Provide Feedback ?

The figure shows a cross section of several conductors carrying currents through the plane. The currents have the magnitudes l₁ = 4 A, 1₂ = 6 A and 13 = 2A. The directions of the currents is shown at the picture. Four paths labeled a through d are shown. What is the line integral of the magnetic field across each path? Each integral involves going around the path in the counter clockwise direction. 1. What is the line integral of the magnetic field across path a? Enter the missing part in the expression Ho 2. What is the line integral of the magnetic field across path b? Enter the missing part in the expression Ho'l 3. What is the line integral of the magnetic field across path c? Enter the missing part in the expression Hol 4. What is the line integral of the magnetic field across path d? Enter the missing part in the expression Ho 110 b 120 d ) ) ) )

A 68.0-cm-diameter cyclotron uses a 450 V oscillating potential difference between the dees. Part A What is the maximum kinetic energy of a proton if the magnetic field strength is 0.740 T? Express your answer with the appropriate units. Value Submit Part B μA Submit Units Request Answer IV—| ΑΣΦ 3 How many revolutions does the proton make before leaving the cyclotron? ? Request Answer ?

Part A A long, straight wire carries a current of 5.20 A. An electron is traveling in the vicinity of the wire. At the instant when the electron is 4.40 cm from the wire and traveling with a speed of 5.90×104 m/s directly toward the wire, what is the magnitude of the force that the magnetic field of the current exerts on the electron? ΑΣφ F = N Submit Request Answer Part B What is the direction (relative to the direction of the current) of this force? opposite to the current in the same direction as the current O perpendicular to the current Submit Request Answer оо

A current of 5.72 A flows along a wire with = (1.382 - 2.095 ) m. The wire resides in a uniform magnetic field B = (-0.350 +0.700 ) T. What is the magnetic force acting on the wire? (Express your answer in vector form.) N

Part B A particle with charge 8.26 x 10-8 C is moving in a region where there is a uniform 0.600 T magnetic field in the +x-direction. At a particular instant, the velocity of the particle has components Vz = -1.80 x 104 m/s, vy = -3.11 x 104 m/s, and vz = 6.35 x 104 m/s. What is the y-component of the force on the particle at this time? Express your answer with the appropriate units. HA х.101 X Fy = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 9 attempts remaining Part C What is the z-component of the force on the particle at this time? Express your answer with the appropriate units. µA F = Value Units Submit Request Answer

The two insulated wires in the diagram above cross at a 30° angle but do not make electrical contact. Each wire carries 7.01 A current. Point 1 is 5.27 cm from the intersection and equally distant from both wires. What is the magnitude of the magnetic field (in T) at point 1?

The magnetic field B at all points within the colored circle of the figure (Figure 1)has an initial magnitude of 0.700 T. (The circle could represent approximately the space inside a long, thin solenoid.) The magnetic field is directed into the plane of the diagram and is decreasing at the rate of 0.0300 T/s. Figure X X X X X B X /b X 1 of 1 10.0 cm Part C What is the current in the ring if its resistance is 4.00 $? ΑΣΦ I = Submit Part D X Incorrect; Try Again; 5 attempts remaining What is the emf between points a and b on the ring? ε = Previous Answers Request Answer Submit Part E ΠΙΑΣΦ Request Answer ? IVE ΑΣΦ ? A If the ring is cut at some point and the ends are separated slightly, what will be the emf between the ends? ? V

▸ Part A What value of magnetic field would make a beam of electrons, traveling to the right at a speed of 5.4×100 m/s. go undeflected through a region where there is a uniform electric field of 9400 V/m pointing vertically up? Express your answer to two significant figures and include the appropriate units. B = 1.7x10-3 T Submit ✓ Correct Part B Previous Answers Part C What is the frequency of the circular orbit of the electrons if the electric field is turned off? Express your answer to two significant figures and include the appropriate units. HA f- Value Submit Request Answer Units ?