A bar of length 0.7 m slides along metal rails at a speed of 1 m/s. The bar and rails are in a magnetic field of 20 T, pointing out into the page. Calculate the motional emf. a) 0.7 V b) 7 V c) 14 V d) 1.4 V

A 20 turn circular loop with diameter 3 cm is placed in a magnetic field of strength 7 T such that the loop’s area vector is parallel to the magnetic field. The magnetic field is reduced to 0 T over some time and this generates a constant voltage of 5 V. How long did it take for the magnetic field to reduce to 0? 3.23 s 15.32 s 0.0198 s 0.0389 s None of the above

A coil of ten turns of area 0.01 m2 and resistance 5 Q is placed perpendicularly inside a magnetic field whose intensity and direction changes as given in the figure. B(T) 2 0.1 0.3 0.5 0.8 0.9 t(s) -2 QUESTION 5 How much power is dissipated by the coil at time = 0.6 seconds? O 0.2 W O 0.4 W O 0,5 W O None of these

AM Mon Nov 7 bconline.broward.edu b) 2.1 nT c) 1.6 nT d) 3.1 nT e) 3.6 nT 48 6. The electric field amplitude of the signal at that point is 0.780 V/m. What is the amplitude of the magnetic field of the signal at that point? a) 2.6 T 67% 1

99. A velocity selector consists of electric and magnetic w fields described by the expressions E Bi, with B = 15.0 mT. Find the value of E such that a 750-eV electron moving in the negative x direction is undeflected. = Ek and B = %3D %3D %3D

Suppose you wish to measure the current in a wire.  You have a device that can measure the strength of the magnetic field produced by the wire, but the device does not directly measure the current.  If the device is place 2.4m away from the wire, and the magnetic field strength is 0.22μT, what is the current running through the wire in Amps?

A 19-turn circular coil of wire has diameter 0.95 m. It is placed with its axis along the direction of the Earth's magnetic field of 44.0 μT and then in 0.200 s is flipped 180°. An average emf of what magnitude is generated in the coil? mV Need Help? Read It Watch It