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03(P)%20-%20Current%20Electricity

# 03(P)%20-%20Current%20Electricity - 3 CURRENT ELECTRICITY 1...

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3 - CURRENT ELECTRICITY Page 1 1 ) Resistance of silver wire is 3 at 30 ° C and at 100 ° C, it is 3.5 . Find its temperature coefficient of resistance. [ March, 2003 ] ( Ans: 2.44 × 10 - -- 3 ° C - 1 ) 2 ) Resistance of a wire is 10.5 at 21 ° C and at 147 ° C it is 16.5 . Find its temperature coefficient of resistance. [ April, 2002 ] ( Ans: 4.56 × 10 - -- 3 ° C – 1 ) 3 ) A conducting wire has a resistance of 20 ohm. Its length is now stretched to increase by 2 %. Calculate the resulting value of the resistance of the wire. [ March, 2002 ] ( Ans: 20.8 ) 4 ) 5 metre long wire is connected with cell. The e. m. f. and internal resistance of the cell are 2.5 V and 0.5 . The resistance of wire is 2 . Find the potential gradient on the wire. [ October, 1998 ] ( Ans: 0.4 V / m ) 5 ) Two resistors 15 and B are connected in parallel. This combination is connected in series to a 5 resistor and a battery of e. m. f. 5 volt. If the current through B ohm resistor is 1 / // 3 A, find the value of B. [ March, 1998 ] ( Ans: 7.5 ΩΩ ) 6 ) A pyramid is constructed from six conductive wires each of resistance ‘ R ’. Calculate the effective resistance between any two vertices of the pyramid. ( Ans: R / 2 ) [ October, 1997, October, 1996 ] 7 ) Three batteries E 1 11 = 1.5 V, E 2 22 = 2.5 V and E 3 33 = 3.5 V and a resistance R = 10 are connected in series to make a loop of closed circuit. In this E 2 and E 3 are in helping position and E 1 11 is in opposite position. Now 5 resistance is connected in parallel to E 2 . Find the current passing through 10 and 5 resistance and battery E 2 22 . ( Ans: 0.45 A, 0.5 A and 0.95 A ) [ March, 1997 ] 8 ) An electron of mass 9 × 10 -28 gm and charge of 1.6 × 10 -19 C moves in a conductor with acceleration of 10 12 m / s 2 . Find potential gradient of the conductor.

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03(P)%20-%20Current%20Electricity - 3 CURRENT ELECTRICITY 1...

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