Figure-7 shows the cross-section of a hollow cylinder of inner radius a = 4.00 cm and outer radius c = 9.00 cm. A uniform current density of 2.50 A/ cm2
flows through the cylinder parallel to its axis.
What is the magnitude of the magnetic field at = 2.00 cm?

explanation: in any substance/object, the particles inside it (atoms/molecules) constantly move in random directions and with random speeds (this motion is called brownian motion). as a result, the particles have some kinetic energy (which is proportional to the temperature of the substance).

explanation:

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the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

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