The magnetic field strength between the poles of a strong electromagnetic at a given moment is b=0.10t. a circular coil of radius r=2.0cm qnd having 10 turns is placed within the field and perpendicular to it. the magnetic field strength increases steadily to 0.25t in 1.2ms. under these conditions :
a) calculate the magnetic flux in the coil initially and after 1.2ms.
b)calculate the emf induced in the coul while the field is changing.
c)if the axis of the coil has made an angle of 35° with the direction of the magnetic field, how would the induced emf have differed?

Amass m = 74 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius r = 18.4 m and finally a flat straight section at the same height as the center of the loop (18.4 m off the ground). since the mass would not make it around the loop if released from the height of the top of the loop (do you know why? ) it must be released above the top of the loop-the-loop height. (assume the mass never leaves the smooth track at any point on its path.) 1. what is the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track? 2. what height above the ground must the mass begin to make it around the loop-the-loop? 3. if the mass has just enough speed to make it around the loop without leaving the track, what will its speed be at the bottom of the loop? 4. if the mass has just enough speed to make it around the loop without leaving the track, what is its speed at the final flat level (18.4 m off the ground)? 5. now a spring with spring constant k = 15600 n/m is used on the final flat surface to stop the mass. how far does the spring compress?