Why (a) is ccw? 2. A square coil of wire with side L=5.00cm contains 100loops an
ID: 1448711 • Letter: W
Question
Why (a) is ccw?
2. A square coil of wire with side L=5.00cm contains 100loops and is positioned perpendicular to a uniform 0.600T magnetic field. It is quickly pulled from the field at constant speed to a region where B drops abruptly to zero. At t=0, the right edge of the coil is at the edge of the field. It takes 0.100s for the whole coil to reach the field-free region. The induced emf is 1.50V and the coil's total resistance is 100 ohm. What is the current induced? the answer is 15.0mA
1) In which case(s) the direction of the induced current is counterclockwise? I decreasing A) Only a B) Only b C) a & b D) b & c E) a & d I increasing / nistant increasing No utrenExplanation / Answer
By using Fleming right hand rule and Lenz law we can get direction of induced current.
Lenz's law states that when an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such, that it produces an current that's magnetic field opposes the change which produces it.
from Fleming right hand rule
By using these two laws in (a) current is CCW
2) L = 5cm , N =100 , B1 =0.6 T , B2 =0 , t =0.1 s, R =100 ohms
From faradays law induced emf = -d(phi)/dt = NA(B1-B2)/t
V = (100*0.05*0.05*0.6)/0.1 =1.5 V
V =iR
i = 1.5/100 = 15 mA
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.