The protein coat of a virus is known as:

If the circle $x^2+y^2+4x-6y+c=0$ bisects the circumference of the circle $x^2+y^2-6x+4y-12=0$,then $c$ is equal to

$A$ lorry and a car moving with the same $K.E.$ are brought to rest by applying the same retarding force,then

$A$ particle is moving in a circle with uniform speed $v$. In moving from a point to another diametrically opposite point:

$A$ flexible wire bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the coil. The radius of the coil changes as shown in the figure. The graph of induced emf in the coil is represented by

If $(2,-1,3)$ is the foot of the perpendicular drawn from the origin to the plane,then the equation of the plane is