From a uniform disk of radius R, a circular hole of radius `R//2` is cut out. The centre of the hole is at `R//2` from the centre of the original disc. Locale the centre of gravity of the resulting flat body.

A positive charge Q is uniformly distributed along a circular ring of radius R. A small test charge q is placed at the centre of the ring.

The weight of an object at the centre of the earth of radius R is

A circular coil of 50 turns and radius 0.2 cm carries a current of 12 A. Find magnetic field at the centre of the coil.

The radius of a circle is 8 cm and the length of its chords is 12 cm. Fid the distance of the from the centre.

The length of a tangent from a point A at distance 5 cm from the centre of the circle is 4 cm.Find the radius of the circle.

The radius of the circle is 5 cm and distance of the chord from the centre of the circle is 4 cm. Find the length.

A circle of radius 'r' is drawn with charge '+q' at the centre. A charge q_0 is brought from the point B to C. Then work done is:

A circular loop of radius 0.3 cm lies parallel to amuch bigger circular loop of radius 20 cm. The centre of the small loop is on the axis of the bigger loop. The distance between their centres is 15 cm. If a current of 2.0 A flows through the smaller loop, then the flux linked with bigger loop