10. A square coil of side 6.50 cm contains 110 loops and its plane is positioned perpendicular to a uniform 0.80-T magnetic field, as shown. It is quickly and uniformly pulled from the field to a region where the B-field drops abruptly to zero. It takes 0.14 s for the whole coil to reach the field-free region. How much power is dissipated in the coil if its resistance is 130 N? 19.0of19 0of19 00f19 oof19.0 oof19 oof19 Xxxx X xxx x Xx x x x x 9f19 0of19 ooff x x x x x x xx x x x x × x x

A 140-turn circular coil has diameter 4.5 cm. A magnetic field perpendicular to the coil is changing at 0.80 T/s.  What is the induced emf in the coil?  The symbology is what is killing me.  I don't understand the logic steps or where you have to substitute values to determiine the emf.

2. An AC generator has 75 rectangular loops on its armature. Each loop is 14.0 cm long and 10.0 cm wide. The armature rotates at 1300 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.700 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator? Volts

A 120V e.m.f is across a transformer's 200-turn primary coil. How many turns should a secondary coil have in order to produce a 30V e.m.f?