To calculate the flux, you first need to know the magnetic field at a distance r from the wire. This is given by:

B(r,t) = mu_{0} I(t)/(2 pi r)

The direction of the magnetic field is according to the right hand rule; if your thumb points in the direction of the current then your fingers point in the way the magnetic field points to. So for positive I, B points into the paper where you've drawn the loop.

The flux is given by the integral of B(r,t) over the surface of the loop. You need to define the sign of the flux by choosing a direction for the outward ...

... (1) if the area of the loop increases, there will be an induced EMF in the loop (2) if the loop is rotated in the magnetic field, there will be an induced EMF...

... As per Lenz's law, direction of the induced current in the loop is such that it induces magnetic field ... Find the average emf induced in the loop during this ...

... 0.5 = 0.007 Volts As per Lenz's law the polarity of the induced emf is such ... hence oppose the magnetic field of the electromagnet which is inducing the emf. ...

... Faraday's Law of Induction for the emf induced in a conducting loop is emf = - N ∆ / ∆ t that is, the magnitude of the induced emf depends upon the number ...

... The field changes to −0.20T in 1.5 s. Find the magnitude of the average induced emf in the loop during this time. A pick-up truck has a width of 79.8 in. ...

... According to faradays law of electromagnetic induction, the average induced emf E is equal to the rate of change of magnetic flux through the loop and hence ...