Which of the following given the value of magnetic field due to small current elememt accordong to Biot -Savart's law

Which of the following gives the value of magnetic field according to, Biot-Savart’s law

Which of the following gives the value of magnetic field according to, Biot-Savart’s law

Write Biot Savart expression for the magnetic field due to a current element in vector form.

Magnetic Field Due to a Current || Biot-Savart Law

(A) : When the observation point lies along the length of the current element, magnetic field is zero. (R) : According to Biot-Savart's law field is defined only when position vector of a point relative to current element is non zero.

Which of the following relation represent Biot-Savart's law?