A conductor with a hollow cavity has a total charge Qtot placed upon it. A small point charge q is then placed within the cavity, through a small hole in the conductor. What will be the resulting residual charge on the outer surface of the conductor, after equilibrium is reached? Qtot О Фout +Qtot + q O Qout = -4 O Qout +Qtot – 4 O Qout -Qtot + 4 O Qout +ą О Фout -Qtot O Qout = +Qtot O Qout -Qtot Two wire segments are made of different materials, having unequal lengths but the same cross-sectional area. The segments are spliced end-to-end, and a total potential difference AV is applied across the ends of the resulting composite wire. What can we say about the current densities and the electric fields within the two segments of wire? O The longer segment of the wire will have a greater electric field and a smaller current density O The two segments will have the same current density, but unequal electric fields. O The two segments will have the same electric field, but unequal current densities. O The two segments will have the same current density, and the same electric field. The shorter segment of the wire will have a greater electric field and a smaller current density

A conductor with a hollow cavity has a total charge Qtot placed upon it. A small point charge q is then placed within the cavity, through a small hole in the conductor. What will be the resulting residual charge on the outer surface of the conductor, after equilibrium is reached? Qtot О Фout +Qtot + q O Qout = -4 O Qout +Qtot – 4 O Qout -Qtot + 4 O Qout +ą О Фout -Qtot O Qout = +Qtot O Qout -Qtot Two wire segments are made of different materials, having unequal lengths but the same cross-sectional area. The segments are spliced end-to-end, and a total potential difference AV is applied across the ends of the resulting composite wire. What can we say about the current densities and the electric fields within the two segments of wire? O The longer segment of the wire will have a greater electric field and a smaller current density O The two segments will have the same current density, but unequal electric fields. O The two segments will have the same electric field, but unequal current densities. O The two segments will have the same current density, and the same electric field. The shorter segment of the wire will have a greater electric field and a smaller current density