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AIEEE Practice Ques - Physics
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Rajesh

icon The Temperature Dependence Of Resistance
  This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.


Statement-1: The temperature dependence of resistance is usually given as R = Ro(1 + a?t). The resistance of a wire changes from 100 O to 150 O when its temperature is increased from 27oC to 227oC. This implies that a = 2.5 ×10-3 /o C.

Statement 2: R = Ri (1 + a?T) is valid only when the change in the temperature ?T is small and ?R = (R - Ro) << Ro.

(1) Statement-1 is true, Statement-2 is false
(2) Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.
(3) Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.
(4) Statement-1 is false, Statement-2 is true


Sol: (1)

Directions: Question numbers 12 and 13 are based on the following paragraph.
A current loop ABCD is held fixed on the plane of the paper as shown in the figure. The arcs BC (radius = b) and DA (radius = a) of the loop are joined by two straight wires AB and CD. A steady current I is flowing in the loop. Angle made by AB and CD at the origin O is 30o. Another straight thin wire with steady current I1 flowing out of the plane of the paper is kept at the origin.

 
 
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