A current is set up a long copper pipe. Is there a magnetic field
inside the pipe?

A current is set up in a long copper pipe. Is there a magnetic field outside the pipe?

A straight horizontal conducting rod of length 0.45 m and mass 60 g is suspended by two vertical wires at its ends. A current of 5.0 A is set up in the rod through the wires. What magnetic field should be set up normal to the conductor in order that the tension in the wires is zero?

A long vertical wire in which a current is flowing produces a neutral point with the earth's magnetic field at a distance of 5 cm from the wire. If the horizontal component of the earth's magnetic induction is 0.18 gauss, then the current in the wire is

Choose the correct option:A rectangular coil of copper wires is rotated in magnetic field.The direction of induced current changes once in each:

How will you prove that current flowing through a copper wire produces magnetic effect?

If a long copper rod carries a direct current, the magnetic field associated with the current will be

A long hollow copper pipe carries a current. Then, the magneic field product is

Figure 9.35 shows a cross-section of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure. :