Assertion (A): A charged particle is moving with velocity v in x - y plane, making an…

Assertion (A): A charged particle is moving with velocity v in \({x}-{y}\) plane, making an angle \(\theta\left(0 \lt \theta \lt \frac{\pi}{2}\right)\)  with x-axis. If a uniform magnetic field \(\overrightarrow{{B}}\) is applied in the region, along \(y\) -axis, the particle will move in a helical path with its axis parallel to x-axis.
Reason \((R)\) : The direction of the magnetic force acting on a charged particle moving in a magnetic field is along the velocity of the particle.