1. What is the sensor that focuses and image in a camera called? converging charge device
cornea
Lens
charge copuled device

The magnetic field inside a superconducting solenoid is 4.50 t. the solenoid has an inner diameter of 6.20 cm and a length of 26.0 cm. determine (a) the magnetic energy density in the field and (b) the energy stored in the magnetic field within the solenoid.

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

Frequency of electromagnetic waves that a radio station is assigned is called