An infinitely long wire lies along the z-axis and carries a steady current lo. A square loop-wire with sides a and carrying a steady current 210 is located in the x-y plane with its center is at the point (0,2a,0) as shown in the figure. What is the torque exerted by wire on the loop if a = 3m ? Mark the choice closest to your solution where all values are assumed to be in SI unit system.
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- please answer d onlySuppose there were an asteroid approaching the Earth-Moon system starting from rest at infinity. Under what conditions would it experience forces directing it toward a collision with the Moon rather than toward a collision with Earth? If it were on a path within a narrow cone where the field lines converge directly toward the Moon it would go there. Otherwise it would end at Earth. All the field lines converge at the Earth rather than the Moon. The field at a distance would take take it with equal probability toward the Earth or toward the Moon. The field would take it mostly through the empty space between Earth and Moon with no collisionA sphere of radius R and mass M has a uniform volume charge density p. The sphere rotates as a rigid object with angular speed about an axis through its center. A) What is the angular momentum of the sphere about this axis? B) What is the magnetic moment of the sphere?
- Three long, straight wires are seen end-on in the figure below. The distance between the wires is r = 0.258 m. Wires A and B carry current IA = IB = 1.54 A, and wire C carries current IC = 3.42 A. Assume (for example) the only forces exerted on wire A are due to wires B and C. Find the force per unit length exerted on the following. (Express your answers in vector form.) (a) wire A fA = N/m (b) wire B fB = N/mA long straight cylindrical shell has an inner radius R; and an outer radius Ro. It carries a current i, uniformly distributed over its cross section. A wire is parallel to the cylinder axis, in the hollow region (r < R;). The magnetic field is zero everywhere in the hollow region. We conclude that the wire: O is on the cylinder axis and carries current i in the same direction as the current in the shell may be anywhere in the hollow region but must be carrying current i in the direction opposite to that of the current in the shell may be anywhere in the hollow region but must be carrying current i in the same direction as the current in the shell is on the cylinder axis and carries current i in the direction opposite to that of the current in the shell O does not carry any currentA charged particle travelling at right angles to a magnetic field undergoes helical motion, involving circular movement around the magnetic field lines. The radius of the circular motion is given by: Rc = where symbols have their conventional meaning (you may want to look at Section 5.1.3 of Unit 11 if you are unsure of these). From the list of possible units, associate the correct unit with each symbol in the equation by dragging and dropping to complete the table below. Symbol Unit Rc m m v |q| B V Ō |q| B kg ns-1 m S ms-2 kg s-2 A-1 с JC-1 N no units W m VA-1 C-1 V-1