A charged particle is moving in a uniform, constant magnetic field. Which one of

Question

A charged particle is moving in a uniform, constant magnetic field. Which one of the following statements concerning the magnetic force exerted on a particle is false? It does no work on the particle. It can act only on a particle in motion. It increases the speed of the particle. It changes the velocity of the particle. It does not change the kinetic energy of the particle. A circular current loop with radius of 0.100 m is located in the x-y plane. A magnetic field of strength 2.5 T makes an angle of 30 degree with the z-axis. If loop carries of 2.0 A, what is the magnitude of the magnetic force on the loop? zero N 1.36 N 0.157 N 0.136 N 0.0785 N An electron moves through a region of crossed electric and magnetic fields. The electric field E = 3000 V/m and is directed straight down. The magnetic field B = 2.0 T and is directed to the left. For what velocity v of the electron into the paper will the electric force exactly cancel the magnetic force? 6000 m/s 4500m/s 3000 m/s 2000 m/s 1500 m/s A long straight wire is in the same plane as a conducting loop. The wire carries an increasing current I in the direction shown in the figure. There will be a clockwise induced current in the loop. There will be a counterclockwise induced current in the loop. There will be no induced emf and no induced current. There will be a clockwise induced enf, but no induced current. There will be a counterclockwise induced emf, but no induced current. An AC generator consists of 6 turns of wire. Each turn has an area of 0.0040 m^2. The loop rotates in a uniform magnetic field (B = 0.20 T) at a constant frequency of 60 Hz. What is the maximum induced emf? 0.064 V 2.4 V 2.9 V 15 V 18 V When an RLC series circuit is in resonance, its impedance is: equal to its resistance a maximum pi/2 Ohm -pi/2 Ohm zero

Explanation / Answer

3) C (the magnetic force always acts perpendicular to the velocity, so the speed remains constant)

4) A (force on a closed current carrying loop due to uniform magnetic field is zero)

5) E ( E = B x V)

6)B (current direction from Lenz's law)

7) E (emf = Nx areax B x angular frequency)

8) A (since, Xc = XL )

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