A soft iron behaves like a magnet only when the wire around it carries current.

A rigid wire consists of a semicircular portion of radius R and two straight sections the wire is partially immersed in a perpendicualr magnetic field B as shown in the figure. Find the magnetic force on the wire if it carries a current i .

A coil carrying current behaves like a magnet.

A piece of iron behaves like a magnet when it is kept very .................. (close/far) to a magnet.

The magnetic induction at the point O, if the wire carries a current I, is

A thin circular wire carrying a current I has a magnetic moment M. The shape of the wire is changed to a square and it carries the same current. It will have a magnetic moment

A solenoid consists of 100 turns of wire and has a length of 10 cm. The magnetic field inside the solenoid when it carries a current of 0.5 A will be :

Wire 1 in Fig. is oriented along the y-axis and carries a steady current I_1 . A rectangular loop located to right of the wire and in the x-y plane carries a current I_2 . Find the magnetic force exerted by wire (1) on the top of wire (2) of length b in the loop, labeled "wire (2)" in the figure.

A soft iron when brought close to a magnet is attracted towards it. Name the phenomenon.

The intensity of uniform magnetic field between poles of a magnetic is H. If a straight wire carrying current is placed in between the poles. The direction of force on the wire is-

A straight wire of diametre 0.5 mm carrying a current of 1 A is replaced by another wire of 1mm diametre carrying same current. The strenth of magnetic field far away is