Answer:
The Magnetic field is 59.13 mT.
Explanation:
Given that,
Number of turns = 400
Radius = 1.0 cm
Frequency = 90 Hz
Emf = 4.2 V
We need to calculate the angular velocity
Using formula of angular velocity
We need to calculate the magnetic flux
Relation between magnetic flux and induced emf
Put the value into the formula
Hence, The Magnetic field is 59.13 mT.
The answer is A
Hope it helps!
The first choice on the list is the correct one.
Answer:
According to the text you have given above,
Pigeons probably eat the plants from people's gardens.
Mice and Rats get food from the trash people.
(I guess this answer will help you :-)