Class XII Apparatus : Two metallic probes (aluminium tubes of 5 mm diameter about 6 cm long), p-n-p transistor AC 128, n-p-n transistor BC 107, a loudspeaker 8Ω, a ceramic capacitor 0.1 F, two resistors (R1 = 4kΩ,1/2 W and R2= 10Ω, 1/2W), 3V battery, switch S, connecting wires, wooden booden, terminals, etc
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