please help with both questions

1.

A coil with the diameter of 1.2 cm has 260 turns of coper wire. The coil is in a uniform magnetic field of 25 mT directed along the length of the coil. The magnetic field suddenly drops to 14 mT within 0.20 ms. Find:

a) The change of magnetic flux through the coil. b) The voltage induced in the coil. c) The induced current in the coil if the resistance of the coil is 27

2.

12.5 cm electromagnet has multiple turns of wire loops of the size of 1.24 in each. When 175 mA steady current runs in coil, the magnetic field of 1.09 mT is measured inside the electromagnet. a) Determine the number of wire turns in the electromagnet. b) Calculate the magnetic flux through the cross section of the electromagnet.