Photograph 7.18 Uses of magnets and electromagnets in daily life direction of the poles.
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Formative Practice
7.3
P
Dry cell
elechi Copper
wire
1. What is a magnetic field?
Iron
2. Figure 1 shows an iron nail coiled with insulated copper wire nail
connected to a dry cell of 1.5 V.
(a) What happens when the switch is turned on the
(b) Mark the direction of the current flow in the copper wire
around the iron nail.
antidekure NS
(c) State the poles of the magnetic field at P and Q.
(d) What happens to the strength of the magnetic field if another
dry cell of 1.5 V is added?

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).

radiation

explanation:

heat is transmitted by radiation