Calculate the peak value of electric and magnetic field produced by a radiation coming from a 100 watt bulb at a distance 3 cm.

An image magnified 2/3 times is produced by a convex mirror of focal length 20 cm. Find the object distance.

Calculate the magnetic field due to a circular coil of 100 turns, radius 30 cm, carrying a current of 10 A, (i) at the centre and (ii) at a point 40 cm away from the centre on its axis.

Calculate the electric field at a point on the axial line of a dipole at 20 cm from the centre. The dipole is made of +- 10mu C charges separated by 1 cm.

An infinitely long straight current carrying wire produces a magnetic field B at a point at a distance 'a' from it. What must be the radius of the circular loop, so that for the same current through it the magnetic field at (II) an axial point, distant equal to the radius of the loop equals B?

An infinitely long straight current carrying wire produces a magnetic field B at a point at a distance 'a' from it. What must be the radius of the circular loop, so that for the same current through it the magnetic field at (i) its dentre equals B/2

Two point charges 0.01muC and -0.01muC are place 10 cm apart in vacuum. Calculated the magnitude of electric field intensity at the middle point of the line joining the charges and mention its direction.

For a long sighted man the least distance of distinct vision is 100 cm. Calculate the power of the lens that will enable him to see an object placed at a distance of 50 cm.