4. (S pt.) A cha rged particle enters a uniform magnetic field. What happens to

Question

4. (S pt.) A cha rged particle enters a uniform magnetic field. What happens to t the kinetic energy to the particle? (a) it decreases (b) it increases (c) it stays the same (d) it changes with the direction of the velocity (e) it depends on the direction of the magnetic field (5 pt.) By Faraday's law of magnetic induction, the instantaneous EMF induced in a circuit containing N tightly wound loop equals the time rate of change of MAGNETIC FLUX through the circuit, e-- Then, how emf can be induced? S. (a) Increase/decrease B-field strength (b) Change area of loop inside B-field (c) Rotating coil in the field (d) All of above (10 pt.) A 25-turn circular coil of wire with a diameter of 1.0m is placed with its axis aligned with the Earth's 8-field, which has a magnitude of 0.5x10 T 0.5 G. During a time interval of 0.2s it's flipped 180. What's the magnitude of the average emf generated during this time? 6.

Explanation / Answer

4)

magentic force acts on the charged particle

magentic force is perpendicular to speed

work done by magnetic force =

work done = change in KE

KE is constant

option ( c )

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5)

magnetic flux = B*A*costheta

flux can be changed by changing B field , area or rotating coil ( changeing angle )

option ( d )

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magnetic flux = N*B*A*costheta

emf = -rate of change in flux

emf = -N*B*A*(costheta2-costheta1)/t

emf = -25*0.5*10^-4*pi*0.5^2(cos180-cos0)/0.2

emf = 9.82*10^-3 V

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