Can a magnetic field line from a closed loop? Explain.

The magnetic field lines

When the number of magnetic field lines through a closed loop changes ,an induced current flows in the coil. Is this statement true.

State the Biot-Savart's law for the magnetic field due to a current carrying element. Use this law to obtain a formula for magnetic field at athe centre of circular loop of radius r carrying steady current I . Sketch the magnetic field lines for a current loop clearly indicating the direction of the field.

Meena draw magnetic field lines of field close to the axis of a current carrying circular loop. As the moves away from the centre of the circuit loop she observes that the lines keep on diverging. How will you explain the observations.

A magnetic field can be produced by

As a result of change in the magnetic flux linked to the closed loop shown in the fig, an e.m.f. V volt is induced in the loop. The work done (joule) in taking a charge Q coulomb once along the loop is

Why do the electrostatic field lines not form closed loops?