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  4. 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 :

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Q. 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 :

Solution:

Magnetic field is given by $\mu_0\, nl$. Here / is doubled and n is unchanged.