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Public Examination March-16
12th Standard - Physics PART – I I
31.
32.
33.
34.
35.
36. a = 10 cm = 10 x 10
-2 m
I = 10 A ; 𝜇0= 4 x 10-7
H/m
B=𝜇0𝐼
2𝜋𝑎 =
4𝜋×10−7× 10
2𝜋×10×10−2 = 2 x 10
-5 N
37.
38.
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39.
40.
41.
42.
43.
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44.
45.
46.
47.
48.
49.
50.
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PART- III
51.
OR
q1 =+1𝜇 C q2 =+3 𝜇 C
q3=-5 𝜇 C r =60 cm = 60 x 10
-2 m
𝑈 =1
4𝜋𝜀0 𝑞1𝑞2
𝑟12+
𝑞1𝑞3
𝑟13+
𝑞2𝑞3
𝑟23
=9 x109 1×10−6×3×10−6
6×10−1+
1×10−6×(−5)×10−6
6×10−1+
3×10−6×(−5)×10−6
6×10−1
=−51
2× 10−2
U =-25.55J = 0.255J
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59.
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Part - IV
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