Assertion: Path of a charged particle in uniform magnetic field cannot be a parabola if no other forces (other than magnetic force) are acting on the particle.

Reason: For parabolic path a constant acceleration is required.

Assertion: Upper wire shown in figure is fixed. At a certain distance $x$, lower wire can remain in equilibrium.

Reason: The above equilibrium of lower wire is stable equilibrium.

Assertion: Net torque in the current-carrying loop placed in a uniform magnetic field (pointing inwards) is zero.

Reason: Magnetic moment is inwards.

Assertion: A charged particle is rotating in a circle. Then, magnetic field at centre of circle and magnetic moment produced by motion of charged particle are parallel to each other.

Reason: $M$ and $B$ are always parallel to each other.

Assertion: If a charged particle enters from outside in uniform magnetic field then it will keep on rotating in a circular path.

Reason: Magnetic force is always perpendicular to velocity vector.

Assertion: Magnetic field and electric field are present in a region. The net force on a charged particle in this region is zero if

$\overrightarrow{E}=\overrightarrow{B}\times \overrightarrow{v}$.

Reason: $\frac{E}{B}$ has the dimensions of velocity.

Assertion: An $\alpha -$particle and a deuteron having the same kinetic energy enter in uniform magnetic field perpendicular to the field. Then the radius of the circular path of $\alpha$-particle will be more.

Reason: $\frac{q}{m}$ ratio of an $\alpha -$particle is more than the $\frac{q}{m}$ ratio of a deuteron.

Assertion: A charged particle is rotating in a circular path in uniform magnetic field. Then, plane of circle is perpendicular to the magnetic field.

Reason: Circular motion is a two-dimensional motion.

Assertion: At the centre of a circular current carrying loop $I_1$, there is an infinitely long straight current carrying wire $I_2$ perpendicular to the plane of the circle. Then, magnetic force of attraction between two is zero.

Reason: Magnetic field of $I_1$ at centre is inwards, parallel to $I_2$.