153456 A toroid has a non-ferromagnetic core of inner radius $20.5 \mathrm{~cm}$ and outer radius $21.5 \mathrm{~cm}$, around which 4200 turns of a wire are wound. If the current in the wire is $10 \mathrm{~A}$, the magnetic field inside the core of the toroid is $\left(\mu_{0}=4 \pi \times 10^{-7} \mathbf{H m}^{-1}\right)$

153457 A long solenoid carrying a current produces a magnetic field $B$ along its axis. If the number of turns per unit length is tripled and the current is halved, then the new value of the magnetic field will be

153458 Two long parallel wires carry equal current $i$ flowing in the same direction are at a distance 2d apart. The magnetic field $B$ at a point lying on the perpendicular line joining the wires and at a distance $x$ from the midpoint is -

153459 A straight conductor of length $32 \mathrm{~cm}$ carries a current of $30 \mathrm{~A}$. Magnetic induction at a point in air at a perpendicular distance of $12 \mathrm{~cm}$ from the mid-point of the conductor is

153456 A toroid has a non-ferromagnetic core of inner radius $20.5 \mathrm{~cm}$ and outer radius $21.5 \mathrm{~cm}$, around which 4200 turns of a wire are wound. If the current in the wire is $10 \mathrm{~A}$, the magnetic field inside the core of the toroid is $\left(\mu_{0}=4 \pi \times 10^{-7} \mathbf{H m}^{-1}\right)$

153457 A long solenoid carrying a current produces a magnetic field $B$ along its axis. If the number of turns per unit length is tripled and the current is halved, then the new value of the magnetic field will be

153458 Two long parallel wires carry equal current $i$ flowing in the same direction are at a distance 2d apart. The magnetic field $B$ at a point lying on the perpendicular line joining the wires and at a distance $x$ from the midpoint is -

153459 A straight conductor of length $32 \mathrm{~cm}$ carries a current of $30 \mathrm{~A}$. Magnetic induction at a point in air at a perpendicular distance of $12 \mathrm{~cm}$ from the mid-point of the conductor is

153456 A toroid has a non-ferromagnetic core of inner radius $20.5 \mathrm{~cm}$ and outer radius $21.5 \mathrm{~cm}$, around which 4200 turns of a wire are wound. If the current in the wire is $10 \mathrm{~A}$, the magnetic field inside the core of the toroid is $\left(\mu_{0}=4 \pi \times 10^{-7} \mathbf{H m}^{-1}\right)$

153457 A long solenoid carrying a current produces a magnetic field $B$ along its axis. If the number of turns per unit length is tripled and the current is halved, then the new value of the magnetic field will be

153458 Two long parallel wires carry equal current $i$ flowing in the same direction are at a distance 2d apart. The magnetic field $B$ at a point lying on the perpendicular line joining the wires and at a distance $x$ from the midpoint is -

153459 A straight conductor of length $32 \mathrm{~cm}$ carries a current of $30 \mathrm{~A}$. Magnetic induction at a point in air at a perpendicular distance of $12 \mathrm{~cm}$ from the mid-point of the conductor is

153456 A toroid has a non-ferromagnetic core of inner radius $20.5 \mathrm{~cm}$ and outer radius $21.5 \mathrm{~cm}$, around which 4200 turns of a wire are wound. If the current in the wire is $10 \mathrm{~A}$, the magnetic field inside the core of the toroid is $\left(\mu_{0}=4 \pi \times 10^{-7} \mathbf{H m}^{-1}\right)$

153457 A long solenoid carrying a current produces a magnetic field $B$ along its axis. If the number of turns per unit length is tripled and the current is halved, then the new value of the magnetic field will be

153458 Two long parallel wires carry equal current $i$ flowing in the same direction are at a distance 2d apart. The magnetic field $B$ at a point lying on the perpendicular line joining the wires and at a distance $x$ from the midpoint is -

153459 A straight conductor of length $32 \mathrm{~cm}$ carries a current of $30 \mathrm{~A}$. Magnetic induction at a point in air at a perpendicular distance of $12 \mathrm{~cm}$ from the mid-point of the conductor is