Two long parallel current carrying wires are separated by 5 cm in air and are carrying current of 20A in the opposite direction. The force per meter length between the two wires will be (in N/m)

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Antenna Array

An antenna array is a group of antennas joined together and arranged in a regular pattern to form a single antenna capable of producing radiation patterns that individual antennas cannot. As the antennas are constructed as an array, sufficient spacing and phase must be given.