(a) Two identical circular loops P and Q, each of radius R carrying current I are kept in perpendicular planes such that they have a common centre O…

Two identical circular loops P and Q , each of radius R carrying current I are kept in perpendicular planes such that they have a common centre O as shown in the figure.

Find the magnitude and direction of the net magnetic field at point O .

A long straight conductor kept along $\displaystyle \mathrm{X}^{\prime} \mathrm{X}$ axis, carries a steady current I along $\displaystyle +x$ direction. At an instant t , a particle of mass m and charge q at point ( $\displaystyle x, \mathrm{y}$ ) moves with a velocity $\displaystyle \vec{v}$ along +y direction. Find the magnitude and direction of the force on the particle due to the conductor.