C1=ε0A/d 
C2=8 K13 d+2 K2d+(d−83 d−2d)ε0 AC2=8 K13+2 K21+81ε0 A/d=8 K13+2(54 K1)1+81ε0 A/dC2=2C18 K13+8 K15+81ε0 A/d=2ε0 A/d⇒ K11+811=2⇒ K11+81=21⇒ K1=38=2.66
NEET UG 2025 — Physics Electromagnetism
The plates of a parallel plate capacitor are separated by d. Two slabs of different dielectric constant K1 and K2 with thickness 83d and 2d, respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. (If K1=1.25K2, the value of K1 is:
Held on 30 Apr 2025 · Verified 9 Jul 2026.
2.66
2.33
1.60
1.33
Sign in to track your attempts and accuracy.
Sign in to keep a private note on this question. Nothing you write is ever public.
Two point charges +2μC and -2μC are placed 10 cm apart. The electric field at the midpoint is:
To an ac power supply of 220 V at 50 Hz , a resistor of $20 \Omega$, a capacitor of reactance $25 \Omega$ and an inductor of reactance $45 \Omega$ are connected is series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively-
A model for quantized motion of an electron in a uniform magnetic field $B$ states that the flux passing through the orbit of the electron is $n(h / e)$ where $n$ is an integer, $h$ is Planck's constant and $e$ is the magnitude of electron's charge. According to the model, the magnetic moment of an electron in its lowest energy state will be ( $m$ is the mass of the electron)
A wire of resistance R is cut into 8 equal pieces. From these pieces two equivalent resistances are made by adding four of these together in parallel. Then these two sets are added in series. The net effective resistance of the combination is :
A 2 amp current is flowing through two different small circular copper coils having radii ratio $1: 2$. The ratio of their respective magnetic moments will be
Work through every NEET UG Electromagnetism PYQ, year by year.