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 30∘. Another straight thin wire with steady current l1 flowing out of the plane of the paper is kept at the origin. 
This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two…
JEE Main 2009 — Physics Electromagnetism
2009mcqeasy
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=R0(1+αΔt). The resistance of a wire changes from 100Ω to 150Ω when its temperature is increased from 27∘C to 227∘C. This implies that α=2.5×10−3/∘C. Statement 2: R=Ri(1+αΔT) is valid only when the change in the temperature ΔT is small and ΔR= (R−R0)≪R0.
Official previous-year question
Held on 30 Apr 2009 · Verified 6 Jul 2026.
Options
- A
Statement-1 is true, Statement-2 is false
- B
Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.
- C
Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.
- D
Statement-1 is false, Statement-2 is true
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