ശബ്ദത്തെ വൈദ്യുതി സിഗ്നലുകൾ ആക്കി മാറ്റുന്നത് എന്ത്?
Aആംപ്ലിഫയർ
Bലൗഡ് സ്പീക്കർ
Cമൈക്രോഫോൺ
Dഡയോഡ്
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Which of the following materials is preferably used in making heating elements of electrical heating devices?
An object placed at a distance of 25 cm from a converging lens forms a real and inverted image at 30 cm from the lens. The magnification produced by the lens is equal to:
Two wires A and B are made of same material and have the same length but different cross-sectional areas. If the resistance. of wire A is 9 times the resistance of wire B, the ratio of the radius of wire A to that of wire B is?
When a magnet is moved into a coil connected to a galvanometer, the current is induced in the coil. The induced current does not depend on which of the following factor?