# A conducting circular loop made of a thill wire, has area 3.5 10−3 m2 and resistance 10Ω.  It is placed perpendicular to a time dependent magnetic field B(1) = (0.4T)sin(50 t).  The field is uniform in space.  Then the net charge flowing through the loop during t = 0 s and  t = 10 ms is close to: a. 14mC b. 21mC c. 6mC d. 7mC

## Question ID - 50046 :- A conducting circular loop made of a thill wire, has area 3.5 10−3 m2 and resistance 10Ω.  It is placed perpendicular to a time dependent magnetic field B(1) = (0.4T)sin(50 t).  The field is uniform in space.  Then the net charge flowing through the loop during t = 0 s and  t = 10 ms is close to: a. 14mC b. 21mC c. 6mC d. 7mC

3537

Q= = A(Bf−Bf)= 3.5 10−3

= (3.5 10−3)(0.4−0)

=1.4 10−4 = 0.14mC

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Two masses m and  are connected at the two ends of a massless rigid rod of length ll.  The rod is suspended by a thin wire of torsional constant k at the centre of mass of the rod-mass system (sec figure). Because of torsional constant k, the restoring torque is =k  for angular displacement 0.  If the rod is rotated by 0 and released, the tension in it when it passes through its mean position will be:

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