Q1. A long, straight wire is in the plane of the page and carries a current of A. Point P is also in a plane of the page and is a perpendicular distance m from the wire. With reference to the coordinate system. what is the direction of the magnetic field at point P because of the current in the wire?
Q2. The length of the mercury column is 4.0cm in pure melting ice and 28.0 cm in the steam. Compute the temperature for a length of 22.0.
Q3. A steel building is 273 m tall when the outside temperature is 0 C. How tall is the building on a hot summer day (30 C)? The change in height is small, so convey the answer with 5 decimal places.