Questions from Modern Physics

Q: A particle with mass m and positive charge q starts from rest

A particle with mass m and positive charge q starts from rest at the origin shown in Fig. P27.82. There is a uniform electric field

Q: If a proton is exposed to an external magnetic field of 2

If a proton is exposed to an external magnetic field of 2 T that has a direction perpendicular to the axis of the proton’s spin, what will be the torque on the proton? (a). 0; (b). 1.4 × 10-26 N ∙ m...

Q: In the situation shown in Fig. 29.18, would

In the situation shown in Fig. 29.18, would it be appropriate to ask how much energy an electron gains during a complete trip around the wire loop with current I'? Would it be appropriate to ask what...

Q: Which of following elements is a candidate for MRI? (

Which of following elements is a candidate for MRI? (a). 12C6; (b). 16O8; (c). 40Ca20; (d). 31P15.

Q: The large magnetic fields used in MRI can produce forces on electric

The large magnetic fields used in MRI can produce forces on electric currents within the human body. This effect has been proposed as a possible method for imaging “biocurrents” flowing in the body, s...

Q: A pair of point charges, q = +8.00

A pair of point charges, q = +8.00 µC and q' = -5.00 µC, are moving as shown in Fig. P28.55 with speeds v = 9.00 × 104 m/s and v' = 6.50 × 104 m/s. When the charges are at the locations shown in the f...

Q: An alpha particle (charge +2e) and an electron move

An alpha particle (charge +2e) and an electron move in opposite directions from the same point, each with the speed of 2.50 × 105 m/s (Fig. E28.4). Find the magnitude and direction of the...

Q: At a particular instant, charge q1 = +4.80

At a particular instant, charge q1 = +4.80 × 10-6 C is at the point (0, 0.250 m, 0) and has velocity

Q: Two long, parallel transmission lines, 40.0 cm apart

Two long, parallel transmission lines, 40.0 cm apart, carry 25.0-A and 75.0-A currents. Find all locations where the net magnetic field of the two wires is zero if these currents are in (a). the same...

Q: A long, straight wire carries a current of 8.60

A long, straight wire carries a current of 8.60 A. An electron is traveling in the vicinity of the wire. At the instant when the electron is 4.50 cm from the wire and traveling at a speed of 6.00 × 10...