A straight rod of mass $m$ and length $L$ is suspended from the identical spring as shown in the figure. The spring stretched by a distance of $x_0$ due to the weight of the wire. The circuit has total resistance $R\Omega$ . When the magnetic field perpendicular to the plane of the paper is switched on, springs are observed to extend further by the same distance. The magnetic field strength is
A straight rod of mass $m$ and length $L$ is suspended from the identical spring as shown in the figure. The spring stretched by a distance of $x_0$ due to the weight of the wire. The circuit has total resistance $R\Omega$ . When the magnetic field perpendicular to the plane of the paper is switched on, springs are observed to extend further by the same distance. The magnetic field strength is
- A
$\frac{{mgR}}{{\varepsilon L}}$ ; directed outward from the plane of the paper
- B
$\frac{{mgR}}{{2\varepsilon {x_0}}}$ ; directed outward from the plane of the paper
- C
$\frac{{mgR}}{{\varepsilon L}}$; directed into the plane of the paper
- D
$\frac{{mgR}}{{2\varepsilon {x_0}}}$ ; directed into the plane of the paper
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