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QAIPMT-2010-Ph-2079: NEET 2010 Physics - Class 12 AIPMT-2010-Ph-2079 Solution: A 220 volt input is supplied to a transformer. The output…
A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80% the current drawn by the primary windings of the transformer is 3.6 ampere 2.8 ampere 2.5 ampere 5.0 ampere
Multiple Choice Options
- A 3 F
- B _ F
- C _ 3 F
- D F
Step-by-Step Verified Solution
When a current carrying loop is placed in a magnetic field, the coil experiences a torque given by _ = N B i A sin _ _ . Torque is maximum when _ = 90 o ,i.e., the plane of the coil is parallel to the field _ max = N B i A
Forces F _ 1 and F _ 2 acting on the coil are equal in magnitude and opposite in direction. As the forces F _ 2 and F _ 2 have the same line of action their resultant effect on the coil is zero. The two forces F _ 3 and F _ 4 are equal in magnitude and opposite in direction. As the two forces have different lines of action, they constitute a torque. Thus, if the force on one arc of the loop is F _ , the net force on the remaining three arms of the loop is - F.