$A$ circular loop of wire and a long straight wire carry currents $I_c$ and $I_e$,respectively,as shown in the figure. Assuming that these are placed in the same plane,the magnetic field will be zero at the centre of the loop when the separation $H$ is:
- A$\frac{I_e R}{I_c \pi}$
- B$\frac{I_c R}{I_e \pi}$
- C$\frac{\pi I_c}{I_e R}$
- D$\frac{I_e \pi}{I_c R}$
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