Aconducting bar of length , moves to the right on two frictionless rails. a uniform magnetic field directed into the page has a magnitude of 0.300 t. assume r = 9.00 ohm and , length (l) = 0.350 m. at what constant speed should the bar move to produce an 8.50- ma current in the resistor?

0.7286 m/s

Explanation:

B = 0.3 T, R = 9 ohm, l = 0.350 m, i = 8.5 m A = 8.5 x 10^-3 A

Let the speed is v.

The motional emf is given by

e = B v l

i x R = B v l

8.5 x 10^-3 x 9 = 0.3 x v x 0.350

v = 0.7286 m/s

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

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.