2. Separate the wires which connect the zinc and the 

 copper, and touch the ends to the tongue. Is there any 

 evidence that something is passing along the wire? 



Touch the tongue with the ends of wires which are 

 not in any way connected with the cell. Do you have the 

 same sensation as before ? 



3. Fasten the free ends of the connecting wires to an 

 electric bell as shown in Figure 



63. What results ? 



4. Connect the wires as in 

 Figure 64. Hold a delicate com- 

 pass in your hand, and notice 

 the exact position of the needle. 

 Then place the compass directly 

 above or beneath the connecting 

 wire and as close as possible to it. 

 Is the needle affected in any 

 way ? 



Try this with the connecting 

 wires slightly separated. Is the 

 needle affected ? 



5. Hold a few iron filings, in FIG. 64. Electric current affects 

 . . , . . the compass needle. 



the palm of your hand, and let the 



connecting wires touch them ; are they affected ? Remove 



the hand, and state whether any filings adhere to the 



wire. 



Try this with the connecting wires slightly separated, 

 and state the result. 



Remarks 



The simple cell made by you in (i) may not be strong 

 enough to affect the bell, the compass, and the filings. 



