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Question

A current I flowing through the loop as shown in the adjoining figure. The magnetic field at center O is
1015361_9a95771548324989ab844ffc0707ba3e.png

A
17μ0I16R
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B
17μ0I16R
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C
5μ0I16R
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D
5μ0I16R
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Solution

The correct option is B 17μ0I16R
No correct option.

Given,

A loop in which current is flowing,

So, Magnetic field due to part 1 is:B1=μ0I2R×34

The magnetic field due to part 2 is: B2=μI2(2R)×14

So the total magnetic field is: B=B1+B2μ0R(38+116)=7μ0I16R


982047_1015361_ans_fdc6e42807814fe48a0ee1904da03a2d.PNG

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