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 :

Question

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) (B/2) (D) (B/4)

Tardigrade Admin · Accepted Answer

Magnetic field is given by μ0 nl. Here / is doubled and n is unchanged.

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 :

$4 B$

$2 B$

$\frac{B}{2}$

$\frac{B}{4}$

Magnetic field is given by $μ_{0} n l$ . Here / is doubled and n is unchanged.