Question
31) A electric motor has a magnetic flux density of 30 Tesla's which covers an area of 250mm^2 . What is the motor's magnetic flux value? a) 75 Wb b) 750 Wb C) 7 .5mWb d) 7 .5uWb
Answer
4.2
(287 Votes)
Delilah
Elite · Tutor for 8 years
Answer
Performing the calculations we get
, Which can be represented as
. Picking from the options, the answer is c)
.
Explanation
## Step1: In the given question, we are given the magnetic flux density (B = 30 tesla) and the area (A = 250 mm²) across which it is spread. We have to find the magnetic flux (
).## Step2: The magnetic flux is the amount of magnetic field passing through a particular area and is calculated using the formula: ### **
** ## Step3: We have B = 30 T and the area is given in mm² which needs to be converted to m² as the standard unit of area in Physics is m². So, A = 250 mm² = 250 * 10^-6 m².## Step4: Substituting these values in the magnetic flux equation from Step 2, we get
.## Step5: Calculate the above multiplication to find the magnetic flux.