Questions/Assignments an expression for the magnetic field at the center of circular loop of current carrying wire erive an expression for the magnetic field at a point on the axis of circular current carrying wire. 3. D erive an expression for the magnetic field at a point distance x away(along the dipole) due to magnetic dipole of moment M. 4. Derive an expression for the magnetic field at a point distance x away (along the perpendicular bisector) due to a magnetic dipole of moment M. 5. Consider a circular coil of radius 5cm and having 10 turns. A current of 0.5 A is passed through the coil. Find the magnetic field at a point on the axial line, which is at a distance 10cm from the center of the coil. For a circular coil of 20 turns and diameter 10cm, find the magnetic field at the center of the coil, if 1A current flows through it. Also obtain the fields at different points on the axial line( for example 2 cm,4 cm.6 cm,8 cm, 10 cm from either side of the coil. Plot a graph of magnetic field versus distance. (Use EXCEL for calculation and graph) For a circular coil experiment, find the distance where the field due to the coil is equal to the horizontal component of Earth's magnetic field. 6. 7.