While carrying electrical current metal wires heat up. Which of the following st
ID: 1624127 • Letter: W
Question
While carrying electrical current metal wires heat up. Which of the following statements are accurate? A) Electric field that makes electrons move also delivers heat to surrounding atoms B) Moving electrons create magnetic field that heats up surrounding atoms C) Collisions between free electrons inside the conductor transfer energy to atoms of the conductor D) Heat is result of electrons having more kinetic energy because the potential difference sets them into motion. E) Statement of the questions is false, metal wires do not heat while carrying electric current A uniform magnetic field of 1T is perpendicular to the plane in which a proton travels with the speed of 3,000 km/s. What is the radius of orbit of a proton? Proton mass, in case you need it, 1.67 times 10^-27 kg A) 1.00 m B) 19.5 cm C) Orbit of a proton is a straight line and it does not have a radius D) 3.1 cm E) None of the above Motional emfs in the Earth's weak magnetic field are ordinarily very small. Consider a metal rod of 1 m in length moving perpendicular with speed of about 3.0 m/s in Earth magnetic field of strength 5 times 10^-5 T .How large is the induced electrical potential? A) 1500 mu V B) 275 m V C) 150 mu V D) 314 mu V E) None of the aboveExplanation / Answer
Answer -9
Charged particles in a magnetic field feel a force perpendicular to their velocity. The value of this force is F = qvB. Since the direction of this force is always perpendicular to its motion. The result is a circular orbit.
Also We Know Centripetal Force in a circular motion F= (m. v^2)/r
Hence, F= (m. v^2)/r = qvB.
r = mv/qB ; where m= 1.6726219 × 10-27
v= 3000 km/s = 3000000 m/s
q = proton charge = 1.60×1019 C
B = 1 T
Putting all the values in above equation we get radius(r) = 3.1cm
Answer -10
The emf induced in a straight conductor of length l moving with velocity v perpendicular to a magnetic field B is-
E = Blv
Where B = 5 × 10-5 ; l = 1 m ; v = 3 m/s
Putting all the values in above equation we get E = 150uV
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