Questions from Modern Physics

Q: A 42-Ω resistor and a 20-Ω resistor are

A 42-Ω resistor and a 20-Ω resistor are connected in parallel, and the combination is connected across a 240-V dc line. (a). What is the resistance of the parallel combination? (b). What is the total...

Q: Four, long, parallel power lines each carry 100-A

Four, long, parallel power lines each carry 100-A currents. A cross-sectional diagram of these lines is a square, 20.0 cm on each side. For each of the three cases shown in Fig. E28.25, calculate the...

Q: Now the three resistors of Exercise 26.8 are connected in

Now the three resistors of Exercise 26.8 are connected in series to the same battery. Answer the same questions for this situation. Exercise 26.8: Three resistors having resistances of 1.60 Ω, 2.40...

Q: A particle with a charge of -1.24 × 10

A particle with a charge of -1.24 × 10-8 C is moving with instantaneous velocity

Q: A particle with mass 1.81 × 10-3 kg

A particle with mass 1.81 × 10-3 kg and a charge of 1.22 × 10-8 C has, at a given instant, a velocity

Q: An electron experiences a magnetic force of magnitude 4.60 ×

An electron experiences a magnetic force of magnitude 4.60 × 10-15 N when moving at an angle of 60.0 with respect to a magnetic field of magnitude 3.50 × 10-3 T. Find the speed of the electron.

Q: A particle with charge 7.80 µC is moving with velocity

A particle with charge 7.80 µC is moving with velocity

Q: A flat, square surface with side length 3.40 cm

A flat, square surface with side length 3.40 cm is in the xy-plane at z = 0. Calculate the magnitude of the flux through this surface produced by a magnetic field

Q: Singly ionized (one electron removed) atoms are accelerated and then

Singly ionized (one electron removed) atoms are accelerated and then passed through a velocity selector consisting of perpendicular electric and magnetic fields. The electric field is 155 V/m and the...

Q: Let Fig. E27.49 represent a strip of an unknown

Let Fig. E27.49 represent a strip of an unknown metal of the same dimensions as those of the silver ribbon in Exercise 27.49. When the magnetic field is 2.29 T and the current is 78.0 A, the Hall emf...