Question

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Answer 1

Answer:

2) C- 1V

3) A-3Ω

4) B-T1>T2

5) None of these

6) B) N&S

7) C) Both a and b {N to S outside magnet and S to N inside magnet}

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Explanation:

2) Volt is the correct unit of potential difference this eliminates all other options.

5) Let l'=3l

volume of wire remains same

V  =  V'

πR²H= πr²h

R²H= r²h

R²l=r²l' ….[height of cylinder= length of wire]

R²l= r²(3l)

R²=3r²

R²/r²=3

Now by substituting values in the formula of resistance we calculate increase in resistance we get increase% as 800%

6) By applying right hand thumb rule and Fleming's left hand rule