To practice problem-solving strategy 28.1 magnetic-field calculations. consider a current-carrying wire of length l carrying a current of magnitude i from left to right. what is the magnetic field contribution dbâ at point p, with coordinates (x, y), due to the current element dlâ at point a, with coordinates (a,0)? assume that y is positive.

The pressure, volume, and temperature of a mole of an ideal gas are related by the equation pv = 8.31t, where p is measured in kilopascals, v in liters, and t in kelvins. use differentials to find the approximate change in the pressure if the volume increases from 14 l to 14.6 l and the temperature decreases from 375 k to 370 k. (round the answer to two decimal places.)

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation