Questions from Modern Physics

Q: Cathode-ray-tube oscilloscopes have parallel metal plates inside them

Cathode-ray-tube oscilloscopes have parallel metal plates inside them to deflect the electron beam. These plates are called the deflecting plates. Typically, they are squares 3.0 cm on a side and sepa...

Q: A parallel-plate air capacitor is to store charge of magnitude

A parallel-plate air capacitor is to store charge of magnitude 240.0 pC on each plate when the potential difference between the plates is 42.0 V. (a). If the area of each plate is 6.80 cm2, what is t...

Q: A 5.00-pF, parallel-plate, air

A 5.00-pF, parallel-plate, air-filled capacitor with circular plates is to be used in a circuit in which it will be subjected to potentials of up to 1.00 × 102 V. The electric field between the plates...

Q: A capacitor is made from two hollow, coaxial, iron cylinders

A capacitor is made from two hollow, coaxial, iron cylinders, one inside the other. The inner cylinder is negatively charged and the outer is positively charged; the magnitude of the charge on each is...

Q: A 5.80-µF, parallel-plate, air

A 5.80-µF, parallel-plate, air capacitor has a plate separation of 5.00 mm and is charged to a potential difference of 400 V. Calculate the energy density in the region between the plates, in units of...

Q: An air capacitor is made from two flat parallel plates 1.

An air capacitor is made from two flat parallel plates 1.50 mm apart. The magnitude of charge on each plate is 0.0180 µC when the potential difference is 200 V. (a). What is the capacitance? (b). Wh...

Q: A capacitor is formed from two concentric spherical conducting shells separated by

A capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner sphere has radius 12.5 cm, and the outer sphere has radius 14.8 cm. A potential difference of 120 V...

Q: Certain sharks can detect an electric field as weak as 1.

Certain sharks can detect an electric field as weak as 1.0 µV/m. To grasp how weak this field is, if you wanted to produce it between two parallel metal plates by connecting an ordinary 1.5-V AA batte...

Q: Long-distance, electric-power, transmission lines always operate

Long-distance, electric-power, transmission lines always operate at very high voltage, sometimes as much as 750 kV. What are the advantages of such high voltages? What are the disadvantages?

Q: A silver wire 2.6 mm in diameter transfers a charge

A silver wire 2.6 mm in diameter transfers a charge of 420 C in 80 min. Silver contains 5.8 × 1028 free electrons per cubic meter. (a). What is the current in the wire? (b). What is the magnitude of...