Add reports from the Electromagnetism Lab

Change-Id: I3a5abfa0b9ff7c834f4df7c03c710b0c5ee0fad2
diff --git a/quad8/electro/lab/p8/data/velocitat_gruixuda.dat b/quad8/electro/lab/p8/data/velocitat_gruixuda.dat
new file mode 100644
index 0000000..aa4e906
--- /dev/null
+++ b/quad8/electro/lab/p8/data/velocitat_gruixuda.dat
@@ -0,0 +1,5 @@
+5 0.58
+10 1.27
+15 1.89
+20 2.95
+25 3.14