Q. What is the effect of increasing the area of a loop in a uniform magnetic field on the magnetic flux?
A.Magnetic flux increases
B.Magnetic flux decreases
C.Magnetic flux remains constant
D.Magnetic flux becomes zero
Solution
Increasing the area of the loop in a uniform magnetic field increases the magnetic flux, as magnetic flux is given by the product of the magnetic field strength and the area.
Q. What is the effect of increasing the number of turns in a coil on the induced EMF when the magnetic flux changes?
A.It increases the induced EMF
B.It decreases the induced EMF
C.It has no effect
D.It makes the induced EMF zero
Solution
According to Faraday's law, the induced EMF is directly proportional to the number of turns in the coil. Therefore, increasing the number of turns increases the induced EMF.
Q. What is the induced EMF in a loop of wire when the magnetic field through it changes at a rate of 5 T/s?
A.0 V
B.5 V
C.10 V
D.15 V
Solution
The induced EMF (ε) is given by Faraday's law of electromagnetic induction: ε = -dΦ/dt. If the rate of change of magnetic field is 5 T/s, then ε = 5 V.
