A circular coil of radius `20 cm` and `20` turns of wire is mounted vertically with its plane in magnetic meridian.A small magnetic needle (free to rotate about vertical axis) is placed at the center of the coil.It is deflected through `45^(@)` when a current is passed through the coil and in equilbrium (Horizontal component of earth's field is `0.34 xx 10^(-4) T`).The current in coil is:

A circuit coil of radius 20 cm and 20 turns of wire is mounted vertically withits plane in the magnetic meridian. A small magnetic needle placed at the center of the coil is deflected through 45^(@) when a current is passed through the coil. What is the value of the current? (horizontal induction of earth's field = 3.6xx10^(-5)Wb//m^(2)

A 2 turn coil of radius 10cm is placed with its plane in magnetic meridian. A small magnetic needle is suspended at the centre of the coil by a torsion free silk thread. On passing a current through the coil, the needle is deflected through 45^@ . Calculate the strength of the current if horizontal component of earth's field is 1*6xx10^-5T

A vertical circular coil of radius 0.1 m and of 10 turns caries a steady current. When the plane of the coil is normal to the magnetic meridian a neutral point is observed at the centre of the coil . If B_(H)=0.314xx10^(-4)T What is the magnitude of the current flowing through the coil?

A vertical circular coil of one turn and radius 9.42 cm is placed with its plane in the magnetic meridian and short magnetic needle is pivoted at the centre of the coil so that it can freely rotate in the horizontal plane. If a current of 6A is passed through the coil, then the needle deflects by (B_(H) = 4 xx 10^(-5)T)

A circular coilof radius 0.157 m has 50 number of turns. It is placed such that its axis is in magnetic meridian. A dip needle is supported at the centre of the coil with its axis of rotation horizontal, and in the plane of the coil. The angle of dip is 30^(@) when a current flows through the coil. The angle of dip becomes 60^(@) on reversing the current. Find the current in the coil assuming that the magnetic field due to the coil is smaller than the horizontal component of earth's magnetic field, H =3xx10^(-5) T.

A circular coil of radius 10 cm, 500 turns and resistance 2 Omega is placed with its plane perpendicular to the horizontal component of the earth's magnetic field. It is rotated about its vertical diameter through 180^@ in 0.5 s. Estimate the magnitudes of the emf and current induced in the coil. Horizontal component of the earth's magnetic field at the place is 3.0 xx 10^(-5) T.

A circular coil of radius 10 cm, 500 turns and resistance 2 Omega is placed with its plane prependicular to the horizontal component of the earth's magnetic field. It is rotated about its vertical diameter through 180^(@) in 0.25 s. Estimate the magnitude of the e.m.f and current induced in the coil. Horizotal component of earth's magnetic field at the place is 3 xx 10^(-5) T .