To calculate the induced emf (electromotive force) in a conductor moving in a magnetic field, we can use the equation:

emf = B * v * L

Where:
emf = induced electromotive force (in volts)
B = magnetic field strength (in teslas)
v = velocity of the conductor (in meters per second)
L = length of the conductor (in meters)

Given:
B = 5 T
v = 0.3 m/s
L = 0.2 m

Substituting these values into the equation, we have:

emf = 5 T * 0.3 m/s * 0.2 m

Simplifying the equation, we get:

emf = 0.3 V

Therefore, the correct answer is option A) 0.3 V.

Explanation:
The induced emf in a conductor moving in a magnetic field is determined by the product of three factors: the magnetic field strength, the velocity of the conductor, and the length of the conductor.

In this case, the conductor is 0.2 meters long and is moving with a velocity of 0.3 meters per second in a magnetic field of 5 teslas. By substituting these values into the equation, we can calculate the induced emf.

The magnetic field strength, denoted by B, represents the intensity of the magnetic field. It is given as 5 teslas in this case.

The velocity of the conductor, denoted by v, represents the speed at which the conductor is moving through the magnetic field. It is given as 0.3 meters per second in this case.

The length of the conductor, denoted by L, represents the distance over which the induced emf is measured. It is given as 0.2 meters in this case.

By multiplying these three factors together, we can calculate the induced emf. The resulting value is 0.3 volts.

Therefore, the correct answer is option A) 0.3 V.