State the principle of calorimetry.

Question

TextMagnetic Field Due to Current-Carrying Circular LoopLatent Heat of FusionSpecific Heat Capacity of SubstancesCalorimetry and Heat Exchange

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A circular loop of radius 10 cm carrying current of 1.0 A lies in x-y plane. A long straight wire lies in the same plane parallel to x-axis at a distance of 20 cm as shown in figure. Find the direction and value of current that has to be maintained in the wire so that the net magnetic field at O is zero.

TextMagnetic Field Due to Current-Carrying Straight ConductorMagnetic Field Due to Current-Carrying Circular Loop

State Biot-Savart's law for the magnetic field due to a current carrying element. Use this law to obtain an expression for the magnetic field at the centre of a circular loop of radius 'a' carrying a current 'I'. Draw the magnetic field lines for a current loop indicating the direction of magnetic field.