Two 0.68 m long conducting rods are rotating at the same speed in opposite directions, and both are perpendicular to a 4.7 T magnetic field. As the drawing shows, the ends of these rods come to within 1.0mm of each other as they rotate. More-over, the fixed ends about which the rods are rotating are connected by a wire, so these ends are at the same electric potential. If a potential difference of 4.5*10^3 V is required to cause a 1.0 mm spark in air, what is the angular speed (in rad/s) of the rods when a spark jumps across the gap?(adsbygoogle = window.adsbygoogle || []).push({});

Is it possible to still use the formula

Voltage potential = velocity * magnetic field * length of rod ?

v = r*angular speed

(4.5*10^3)/(4.7*.68) = v = r * angular speed

i got the angular speed as 2070 rad/sec. Is this correct how i solved the question? if not can you correct me. Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Electromagnetic induction and conducting rods

**Physics Forums | Science Articles, Homework Help, Discussion**