\( a b c d \) is a square. There is a current \( I \) in wire efg a...

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\( a b c d \) is a square. There is a current \( I \) in wire efg as shown.
\( \mathrm{P} \)
W
Choose the correct options.
(a) Net magnetic field at \( a \) is inwards
(b) Net magnetic field at \( b \) is zero
(c) Net magnetic field at \( c \) is outwards
(d) Net magnetic field at \( d \) is inwards
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