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The magnetic induction field strength at a distance 0.2 m on the axial line of a short bar magnet of mement 3.6Am^(2) is

The magnetic induction field strength at a distance 0.3 m on the axial line of a short bar magnet of moment 3.6 Am^(2) is

The symbol of electrical component whose Ionger vertical line represents positive terminal while short and thick line denotes negative terminal is ______.