hai dòng điện có cường độ I1=2A, I2=4A. chạy trong hai dây dẫn thẳng dài vô hạn, đồng phẳng , vuông góc với nhau trong không khí . trong mặt phẳng có hai dòng điện , quỹ tích tại đó véc tơ tại đó cảm ứng từ bằng 0 là đường thẳng nào ?

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.)

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=