(c) $\vec{B} \cdot \vec{A}$
(c) Rate of change of magnetic flux
False (It is a scalar quantity, being a dot product)
$e = -N \frac{d\Phi_B}{dt}$
(d) $0^\circ$ (Because $\Phi = BA\cos(0^\circ) = BA$, which is maximum)
(b) North pole (to repel the approaching North pole, opposing the change)
False (It determines the direction, not the magnitude)
True (To oppose the decrease, it tries to increase inward flux, hence clockwise current)
(b) Fleming's Right-Hand Rule
No (It is in perfect accordance with it)
(b) $\frac{1}{2} B \omega l^2$
True (Velocity cross Magnetic field is zero)
False (EMF depends only on $B, l, v$. Induced *current* depends on resistance)
$P = \frac{B^2 l^2 v^2}{R}$
(a) Parallel to the magnetic field
(c) Bulk solid metallic blocks
(b) Laminated soft iron cores
(d) Electric room heaters (resistance wire)
True (due to $I^2 R$ losses)
False (They waste energy as heat and are minimized)
Magnetic (or Electromagnetic / Eddy)
Foucault (Foucault currents)
(b) Reduce the eddy currents
(a) $\frac{\mu_0 N^2 A}{l}$
Orientation (or distance/position)
True (Since $L = \Phi / I$)
False (It heavily increases it due to high permeability $\mu_r$)
$M = \mu_0 n_1 n_2 \pi r^2 l$ (where $r$ is radius of inner coil)
(c) Mechanical energy into electrical energy
(c) Electromagnetic Induction
Continuously (or periodically)
False (Slip rings are used in AC; split rings are used in DC generators)
$e(t) = E_0 \sin(\omega t)$
Angular velocity (or Angular frequency)
