Class 12 Physics: Electromagnetic Induction (Hard)

1. Q1. A metallic rod of length 'l' is rotated with an angular frequency 'ω' perpendicular to a uniform magnetic field 'B' about an axis passing through one end of the rod. The EMF induced across the ends of the rod is:
   • Bωl
   • Bωl^2
   • 1/2 Bωl^2
   • 1/2 Bω^2l
2. Q2. Two coils P and Q are placed close to each other. If the current in coil P is changed, some EMF is induced in coil Q. Which of the following statements is INCORRECT?
   • The induced EMF in Q depends on the rate of change of current in P.
   • The induced EMF in Q depends on the mutual inductance between P and Q.
   • The induced EMF in Q opposes the change in current in P.
   • The induced EMF in Q directly depends on the instantaneous current in P.
3. Q3. According to Lenz's Law, the direction of induced current is such that it _________ the cause producing it.
4. Q4. An inductor of inductance L, a capacitor of capacitance C, and a resistor of resistance R are connected in series across an AC source. The circuit is at resonance. What is the phase difference between the voltage across the inductor and the voltage across the capacitor?
   • 0 degrees
   • 45 degrees
   • 90 degrees
   • 180 degrees
5. Q5. A bicycle wheel with metallic spokes of 1 meter length rotates at 120 RPM in a place where the Earth's magnetic field component perpendicular to the plane of the wheel is 0.5 x 10^-4 T. Calculate the EMF induced between the axle and the rim of the wheel.

+ 5 more in the printable PDF.