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A current in a conductor produces a magnetic field that can be calculated using the Biot – Savart law. Because cur- rent is defined as the rate of flow of charge, what can you conclude about the magnetic field produced by stationary charges? What about that produced by moving charges?
Describe the change in the magnetic field in the interior of a solenoid carrying a steady current I (a) if the length of the solenoid is doubled but the number of turns remains the same and (b) if the number of turns is doubled but the length remains the same.
Two spherical objects have masses of 3.1 x 105 kg and 6.5 x 103 kg. The gravitational attraction between them is 65 N. How far apart are their centers?
Calculate the temperature at which root mean square speed of a gas molecules is double of its speed at 27°C pressure remaining constant
A flat coil with 78 loops of wire has a radius of 15 mm. The coil is placed in a magnetic field of 0.35 T so that a maximum flux goes through it. It is later rotated in 0.07 s to a position so that no flux can go through. What is the average induced EMF produced between the terminals of the coil?
Consider a spacecraft moving at 0.95c travelling past an observer on Earth. The said observer and the occupant of the ship each start identical alarm clocks set to ring after 15 hours. With respect to the observer on Earth, at what time will the Earth clock read when the spacecraft clock rings?
Explain why determining the temperature of a star using the conversion formula Tkelvin=Tcelsius+300 is ok, but when determining the temperature of a human being, using Tkelvin=Tcelsius+273.15 is better.
A cook uses a microwave oven to heat a meal. The radiation wavelength is 9.25 cm. What is the energy of one photon of this microwave radiation?
2. An infinitely long wire that has a radius of 3 cm contains a uniform charge density of 15 μC/m2. Determine the total charge present in a 3.0-m long section of the copper wire and the magnitude of the electric field at a distance of 12 m from the wire.
How much ice at -20°c must be dropped on 0.5 kilograms of water initially at 20°c in oder for the final temperature to be 0°c with the ice all melted. Heat capacity of container can be neglected
A boy stands 42.35 m in front of a flat mirror, how far away from him will his image be in the mirror?
