What effect does adding more loops to the wire coil have on the electromagnet?

a. the current will need to increase.

b. the magnetic field will increase

c. the electromagnet will increase in size

d. the iron core will need to be larger

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?