A23-turn circular coil of radius 3.40 cm and resistance 1.00 ω is placed in a magnetic field directed perpendicular to the plane of the coil. the magnitude of the magnetic field varies in time according to the expression b = 0.010 0t + 0.040 0t2, where b is in teslas and t is in seconds.

calculate the induced emf in the coil at t = 5.40 s.

Emf will be                

Explanation:

We have given number of turns N = 23

Radius of the coil r = 3.40 cm = 0.034 m

So area of the coil

Magnetic field is given as

We have to find the emf at t = 5.4 sec

We know that emf is given by

So emf at t = 5.4 sec

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note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.