$($i$)(1$ pt$)$ An EM wave travels in the $+$x direction. At one instant its E$-$field points in

the $+$y direction and the B$-$field points in the $\_\_\_\_\_$ direction

$($A$)+$y$,($B$)-$y$,($C$)+$z$,($D$)-$z$.($E$)+$x $($F$)-$x

$($ii$)(1$ pt$)$ An EM wave$$s magnetic field amplitude is $6\mathrm{.}0$T$.$ Its electric field amplitude is $\_\_\_\_\_\_$

$($A$)2\mathrm{.}70$x$103$ V$/$m$,($C$)3\mathrm{.}00$x$10-14$ V$/$m$,$

$($B$)1\mathrm{.}80$x$103$ V$/$m$,($D$)2\mathrm{.}00$x$10-14$ V$/$m

$($iii$)(1$ pt$)$ An adiabatic process is one where.

$($A$)$ Work is zero, $($C$)$ Heat exchange is zero,

$($B$)$ Temperature change is zero, $($D$)$ Volume change is zero.

$($iv$)(1$ pt$)$ There are three identical spheres with different charges $($QA$=+8$C$,$ QB $=+4$C$,$ QC$=-12$C$)$

QA is briefly touched to QC then QC is briefly touched to QB $,.$ The final charge on Q C is $\_\_\_\_\_.$

$($A$)+1$C $($B$)-1$C $($C$)+1/2$ C $($D$)-1/2$ C $($E$)0$ C

$($v$)(1$ pt$)$ The magnitude of voltage drop across an inductor is proportional to $\_\_\_\_\_\_$

$($A$)$ the charge on the inductor, $($B$)$ the magnitude of current through the inductor,

$($C$)$ the change in current through the inductor, $($D$)$ the direction of current in the inductor