Related InterviewSolutions

• A closely wound coil has a radius of 6.00 cm and carries a current of `2.50 A`. How many turns must it have if, at a point on the coil axis `6.00 cm` from the centre of the coil, the magnetic field is `6.39 xx 10^-4T` ?
• A small coil of radius 0.002 m is placed on the axis of a magnet of magnetic moment `10^(5)` `JT^(-1)` and length 0.1 m at a distance of 0.15 m from the centre of the magnet. The plane of the coil is perpendicular to the axis of the magnet. Find the force on the when a current of 2.0 A is passed through it.
• A magnet is suspended at an angle `60^(0)` in an external magnetic field of `5xx10^(-4)T`. What is the work done by the magnetic field in bringing it in its direction? `["The magnetic moment"=20A-m^(2)]`
• A magnet is suspended in the magnetic meridian with an untwisted wire. The upper end of wire is rotated through `180^(@)` to deflect the magnet by `30^(@)` from magnetic meridian. When this magnet is replaced by another magnet, the upper end of wire is rotated through `270^(@)` to deflect the magnet `30^(@)` from magnetic meridian. The ratio of magnetic moment of magnets is
• A small magnet of magnetic moment `pixx10^(-3) Am^(2)` is placed on the Y-axis at a distance of 0.1 from the origin with its axis parallel to the X-axix. A coil have 169 turns and radius 0.05 m is placed on the X-axis at a distance of 0.12 m from the origin with the axis of the coil coinciding with the X-axis. Find the magnitude and direction of the current in the coil for a compass needle placed at the origin, to point in the north-south direction.
• A short magnet porduces a deflection of `30^(@)` when placed at certain distance in tanA position of magnetometer. If another short magnet of double the length and thrice the pole strength is placed at the same distance in tan B position of the magnetometer, the deflection produced will be-
• A wire carrying current `i` has the configuration as shown in figure. Two semi-infinite straight sections, both tangent to the same circle, are connected by a circular arc of central angle theta, along the circumference of the circle, with all sections lying in the same plane. What must be for `B` to be zero at the centre of the circle?
• The force experienced by a pole of strength 100 Am at a distance of 0.2 m from a short magnet of length 5 cm and pole strength of 200 Am on its axial line will be
• A magnet of length `0.1 m` and pole strength `10^(-4)` A.m. is kept in a magnetic field of `30 Wb//m^(2)` at an angle `30^(@)`. The couple acting on it is `…xx10^(-4)Nm`.
• Find the magnetic induction vector at origin O due to the current carrying wire configuration as shown in figure-4.33.