4. (5 pt.) A charged particle enters a uniform magnetis the particle? field. Wha

Question

4. (5 pt.) A charged particle enters a uniform magnetis the particle? field. What haopens teo (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. (5 pt.) By Faraday's law of magnetic induction, the instantan als the time rate of change of MAGNETIC Fn containing N tightly wound loop equals the time rate of cha circuit, ?--Nast_. Then, how emf can be induced? (a) Increase/decrease B-field strength (b) Change area of loop inside B-field (c) Rotating coil in the field (d) All of above placed with its axis aligned with During a time interval of 02s 6. (10 pt.) A 25-turn circular coil of wire with a diameter of 1.0 m is the Earth's B-field, which has a magnitude of 0.5x10 T 0.5 G. Du it's flipped 180. What's the magnitude of the average emf generated during this t hat is the resulting 7. (5 pt.) A power line carries 1000 A at a height of 20 m above the ground. W magnetic field at ground level? (d) 1011T (e) 5.0 pT (a) 50mT (b) 0.13 mT (c) 13 ? T (5 pt.) When an RLC series circuit is in resonance, its impedance is (a) Equal to its resistance 8. (d) a maximum (e) zero

Explanation / Answer

4) (c) it stays the same.

5) (d) all of above

6)

The flux before the flip is

phi1 = AB = N*pi*r2B        (1)

And the flux after the flip is

pji2 = ?AB = ?N*pi*r2B   (2)

From Ampere’s law

? = ?dphi/dt

= ?2N*PI*r2B/dt

= 9.82 mV

7) (d) 10uT

B = u0I/2pi*r = 10 uT

8) (a) Equal to its resistance

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