Physics Test 19...

A non-conducting rod AB of length l has a total charge q. The rod is rotated about an axis passing through its center of mass with a constant angular velocity ω as shown in the figure. The magnetic moment of the rod is

The distance between two parallel plates of a capacitor is a. A conductor of thickness b(b < a) is inserted between the plates as shown in the figure. The variation of effective capacitance between the plates of the capacitor as a function of the distance (x) is best represented by

A solid sphere of radius R, and dielectric constant ‘k’ has spherical cavity of radius R/4. A point charge q₁ is placed in the cavity. Another charge q₂ is placed outside the sphere at a distance of r from q₁. Then Coulombic force of interaction between them is found to be ‘F₁’. When the same charges are separated by same distance in vacuum then the force of interaction between them is found to be F₂ then

Energy stored in the capacitor in it’s steady state is

A point charge of 0.1C is placed on the circumference of a non-conducting ring of radius 1m which is rotating about an axis passing from centre and perpendicular to the plane of ring with a constant angular acceleration of 1 rad/sec². If ring starts from rest at t = 0, the magnetic field at the centre of the ring at t = 10 sec, is

In an L – C circuit shown in the figure, C = 1F, L = 4H. At time t = 0, charge in the capacitor is 4C and it is decreasing at a rate of √5 C/s. Choose the correct statements.

A solid conducting sphere of radius r is having a charge Q and point charges +q and –q are kept at distances d from the center of sphere as shown in the figure. The electric potential at the centre of solid sphere

Consider the circuit in the adjacent figure. What will be potential difference between A and B in the steady state

A charge q is placed at some distance along the axis of a uniformly charged disc of surface charge density σ C/m². The flux due to the charge q through the disc is ϕ. The electric force on charge q exerted by the disc is

In the given circuit diagram, find the heat generated on closing the switch S. (Initially the capacitor of capacitance C is uncharged)