Find the electric field at centre of semicircular ring shown in figure .
.

Find the electric field at the centre of a semicircular ring if it is uniformly positive charged.

Find the magnetic field at the centre of the circular loop shown in figure.

Find the magnetic field at the centre of the circular loop shown in figure.

Find the magnetic field at the centre of the circular loop shown in figure.

Find the magnetic field at the centre O of the loop shown in the figure

Find the magnetic field at the centre O of the loop shown in the figure

Find the magnetic field at the centre O of the loop shown in the figure

Find the magnetic field at the centre O of the loop shown in the figure.

Two semicircular rings lying in same plane, of uniform linear charge density lambda have radius r and 2r. They are joined using two straight uniformly charged wires of linear charge density lambda and length r as shown in figure. The magnitude of electric field at common centre of semi circular rings is -