Questions
A given length of a wire carries a steady current. It is bent first to form a circular plane coil of one turn. If a loop of same length is now bent more sharply to give a double loop of smaller radius, the magnetic field at the centre caused by the same current is :
a
a quarter of its first value
b
unaltered
c
four times of its first value
d
half of its first value
detailed solution
Correct option is C
When the wire is coiled more sharply, the radius is halved. Also the current becomes double because of two turns. Hence the magnetic field becomes 4 timesTalk to our academic expert!
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