Questions from Modern Physics

Q: A particle with charge 7.26 × 10-8 C

A particle with charge 7.26 × 10-8 C is moving in a region where there is a uniform 0.650-T magnetic field in the +x-direction. At a particular instant, the velocity of the particle has components vx...

Q: If two deuterium nuclei (charge +e, mass 3.

If two deuterium nuclei (charge +e, mass 3.34 × 10-27 kg) get close enough together, the attraction of the strong nuclear force will fuse them to make an isotope of helium, releasing vast amounts of e...

Q: In the Bohr model of the hydrogen atom (see Section 39

In the Bohr model of the hydrogen atom (see Section 39.3), in the lowest energy state the electron orbits the proton at a speed of 2.2 × 106 m/s in a circular orbit of radius 5.3 × 10-11 m. (a). What...

Q: In a shunt-wound dc motor with the field coils and

In a shunt-wound dc motor with the field coils and rotor connected in parallel (Fig. E27.47), the resistance Rf of the field coils is 106 Ω, and the resistance Rr of the rotor is 5.9 Ω. When a potenti...

Q: You wish to hit a target from several meters away with a

You wish to hit a target from several meters away with a charged coin having a mass of 4.25 g and a charge of +2500 µC. The coin is given an initial velocity of 12.8 m/s, and a downward, uniform elect...

Q: A particle with negative charge q and mass m = 2.

A particle with negative charge q and mass m = 2.58 × 10-15 kg is traveling through a region containing a uniform magnetic field

Q: Suppose the electric field between the plates in Fig. 27.

Suppose the electric field between the plates in Fig. 27.24 is 1.88 × 104 V/m and the magnetic field in both regions is 0.682 T. If the source contains the three isotopes of krypton, 82Kr...

Q: A mass spectrograph is used to measure the masses of ions,

A mass spectrograph is used to measure the masses of ions, or to separate ions of different masses (see Section 27.5). In one design for such an instrument, ions with mass m and charge q are accelerat...

Q: In deriving the force on one of the long, current-

In deriving the force on one of the long, current-carrying conductors in Section 28.4, why did we use the magnetic field due to only one of the conductors? That is, why didn’t we use the total magneti...

Q: A straight piece of conducting wire with mass M and length L

A straight piece of conducting wire with mass M and length L is placed on a frictionless incline tilted at an angle