a. What is wheat stone bridge? Explain with a diagram the balancing, the principles and its workings.b. A long straight wire carries a current of 30 mA. Find magnitude of the magnetic field at a distance of 25 cm from it.

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a. What is wheat stone bridge? Explain with a diagram the balancing, the principles and its workings.b. A long straight wire carries a current of 30 mA. Find magnitude of the magnetic field at a distance of 25 cm from it.