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A length of wire carries plane current; it is bent first to form a circular plane coil of one turn. The 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) A half of its first value


A length of wire carries plane current; it is bent first to form a circular plane coil of one turn. The 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)      A half of its first value


Grade:10

1 Answers

Deepak Patra
askIITians Faculty 471 Points
9 years ago

c)      Four times of its first value

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