The current carrying conductor AB in plane of paper in which current flow from B to A as shown in figure below.
AQ
r2
А.
a. Find the direction of the magnetic field produced by it at points P and Q2
b. Given ri >r2. where will the strength of magnetic field be larger? Give
reason.
c. If the polarity of battery connected to the wire is reversed. how would the
direction of the magnetic field be changed?
d. Name and state the rule that is used to find the direction of the magnetic
field for straight current carrying conductor.​

The gravitational attraction between two objects will if one object acquires more mass .

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

The movement of electrons between atoms is called an