long, straight wire lies on a horizontal table in the xy-plane and carries a current of 1.20 μA in the positive x-direction along the x-axis. A proton is traveling in the negative x-direction at speed 2.3 × 104 m/s a distance d above the wire (i.e. z = d). (a) What is the direction of the magnetic field of the wire at the position of the proton? (b) What is the direction of the magnetic force acting on the proton?

A long straight wire suspended in the air carries a conventional current of 7 amperes in the -x direction as shown (the wire runs along the x-axis). At a particular instant an electron at location m has velocity m/s. z out (a) What is the magnetic field due to the wire at the location of the electron? B = tesla (b) What is the magnetic force on the electron due to the current in the wire? F= N (c) If the moving particle were a proton instead of an electron, what would the magnetic force on the proton be? F =

Figure (a) shows two wires, each carrying a current. Wire 1 consists of a circular arc of radius R = 0.017 m and two radial lengths; it carries current i₁ = 2.0 A in the direction indicated. Wire 2 is long and straight; it carries a current is that can be varied; and it is at distance R/2 from the center of the arc. The net magnetic field B due to the two currents is measured at the center of curvature of the arc. Figure (b) is a plot of the component of B in the direction perpendicular to the figure as a function of current i2. The horizontal scale is set by i2s = 1.0 A. What is the angle subtended by the arc? Number i 1.99 421 (a) Units rad B V 0 ią (A) 125

An infinitely long wire carries a current of I = 160 A. Consider a circle with a radius r and centered on the wire. Determine the magnitude of the magnetic field B at points along the circle in terms of I and r.

A conductor consists of a circular loop of radius R=15 cm and two straight, long sections.The wire lies in the plane of the paper and carries a current of i=1.00 A. Determine the magnitude and direction of the magnetic field at the centre of the loop.