In the above circuit diagrams A is the ammeter and V is the Voltmeter. Which of the circuits is correct for finding the correct value of the resistance R
The fig above shows a conductor PQ carrying a current I in the direction shown. At a particular position near the conductor is a compass needle K. Neglecting the earth's magnetic field, the compass needle will
A.
settle in any direction
B.
settle in a fixed direction only if the conductor PQ is a magnetic material
C.
settle in a fixed direction WHETHER the conductor PQ is a magnetic material OR NOT
