Old is Gold-Magnetic effect of current solved numericals

69.

Please see the question from OIG.

ans:

70.

Please see the question from OIG.

ans:

71.

Please see the question from OIG.

ans:

and

72.

Please see the question from OIG.

ans:

and

73.

Please see the question from OIG.

ans:

same as 71.

74.

Please see the question from OIG.

ans:

75.

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ans:

76.

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ans:

77.

Please see the question from OIG.

ans:

BLANK

78.

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ans:

79.

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ans:

80.

Please see the question from OIG.

ans:

81.

Please see the question from OIG.

ans:

same as 80.

82.

Please see the question from OIG.

ans:

83.

Please see the question from OIG.

ans:

84.

Please see the question from OIG.

ans:

85.

Please see the question from OIG.

ans:

86.

Please see the question from OIG.

ans: 

same as 71.

87.

Please see the question from OIG.

ans:

same as 80.

88.

Please see the question from OIG.

ans:

89.

Please see the question from OIG.

ans:

That's it 

IF you find any mistakes in the solution let me know in the comment section below.

Thank you!!!!!

Here OIG stands for Old Is Gold.