Explanation:
(a) Displacement of an object is the shortest path covered by it.
In this problem, a student is biking to school. She travels 0.7 km north, then realizes something has fallen out of her bag. She travels 0.3 km south to retrieve her item. She then travels 0.4 mi north to arrive at school.
0.4 miles = 0.64 km
displacement = 0.7-0.3+0.64 = 1.04 km
(b) Average velocity = total displacement/total time
t = 15 min = 0.25 hour
Hence, this is the required solution.
Answer:
The direction of current in the second wire will be upward.
Explanation:
We first need to find the direction of the magnetic field due to the first wire using the right-hand thumb rule.
Knowing that, one can easily find the direction of the second wire by using the right-hand rule.
The force per unit length on wire 2 due to wire 1 is given by,
Therefore,
<em>Image attached for better understanding of the problem.</em>
<em>(Source: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html)</em>
