Question
Physics Question on Magnetic Field
The magnetic field inside a toroidal solenoid of radius R is B. If the current through it is doubled and its radius is also doubled keeping the number of turns per unit length the same magnetic field produced by it will be :
A
4B
B
2B
C
2B
D
4B
Answer
2B
Explanation
Solution
Magnetic field is given by μ0nl. Here / is doubled and n is unchanged.