Near San Francisco, where the vertically downward component of the earth's magnetic field is 6.8 x 10-5 T, a car is traveling forward at 17 m/s. The width of the car is 2.1 m. Find the emf induced between the two sides of the car. If positive charge accumulates on the driver's side, the enter the emf as a positive number. If negative charge accumulates on the driver's side, the enter the emf as a negative number.

To find the emf induced between the two sides of the car, we can use the formula:

emf = B * v * d

where:
B is the magnitude of the magnetic field,
v is the velocity of the car, and
d is the width of the car.

Let's plug in the given values into the formula:

B = 6.8 x 10^-5 T
v = 17 m/s
d = 2.1 m

emf = (6.8 x 10^-5 T) * (17 m/s) * (2.1 m)
emf = 2.0156 x 10^-3 V

Since positive charge accumulates on the driver's side, we enter the emf as a positive number.

Therefore, the induced emf between the two sides of the car is 2.0156 x 10^-3 V.