Which logic gate is represented by the following combination of logic gates?

$A$ proton and an $\alpha$-particle are accelerated through a potential difference of $100 \ V$. The ratio of the wavelength associated with the proton to that associated with an $\alpha$-particle is

Two concentric coils each of radius equal to $2\pi \, cm$ are placed at right angles to each other. $3\, A$ and $4\, A$ are the currents flowing in each coil respectively. The magnetic induction in $Wb/m^2$ at the centre of the coils will be $(\mu_0 = 4\pi \times 10^{-7} \, Wb/A \cdot m)$.

Which of the following minerals is not remobilized in plants?

The area (in square units) bounded by the curves $y^2=4x$ and $x^2=4y$ in the plane is

The equations $x-y=4$ and $x^2+4xy+y^2=0$ represent the sides of a/an