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1). Voltage ,electric potential difference , electric pressure or electric tension is the difference in electric potential .
2). Rheostat ...... When only two terminals are used it function as a variable resistance and is called as Rheostat .
3). The graph between potential difference V and the current I flowing through a metalic conductor is a straight line curve . In the opreting range of values relations between the V and I is linear
4). A region around a moving electric charge within which the force of magnetism acts .
5). Hans Christian oerestad conducted experiments related to electricity and magnetism .He conducted many experiments ; and finally concluded that the current carrying wire produces a magnetic field around its surface the compass needle showed deflection when it was placed nearby current carrying wire
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