Week 6 Day 2 Concept Question Velocity Selector Correct answer 4 Electrons with charge e and mass m are emitted from the cathode C and accelerated toward slit A with different speeds in the direction shown The electrons enter a region with a downward pointing electric eld magnitude E and a magnetic eld magnitude E that points into the plane of the gure The electrons that travel on a straight trajectory through the plates have speed v E B Lorentz Force Law Force on charged particles in electric and magnetic elds Magnetic Force on a Current Carrying Wire If the wire is a uniform magnetic eld then If the wire is also straight then Group Problem Current Loops A conducting rod of uniform mass per length and length l is suspended by two exible wires in a uniform magnetic eld of magnitude B which points out of the page and a uniform gravitational eld of magnitude g pointing down If the tension in the wires is zero what is the magnitude and direction of the current in the rod
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