Electromagnetic induction : 7
Dear Readers,
JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts..
Q1.
An infinitely cylinder is kept parallel to an uniform magnetic field B directed along positive z axis. This direction of induced current as seen from the z axis will be
Solution
c
c
Q2.A long solenoid of length L, cross section A having N1 turns has wound about its centre a small coil of N2 turns as shown in fig. The mutual inductance of two circuits is
Solution
b
b
Q3. A coil carrying a steady current is short-circuited. The current in it decreases α times in time t_0. The time constant of the circuit is
Solution
b
b
Q4. Two identical conductors P and Q are placed on two frictionless rails R and S in a uniform magnetic field directed into the plane. If P is moved in the direction shown in figure with a constant speed, then rod Q
Solution
a
a
Q5.Given L1=1 mH,R1=1 Ω,L2=2 mH,R2=2 Ω
Neglecting mutual inductance, the time constants (in ms) for circuits (i), (ii) and (iii) are
Solution
a
a
Q6. 6. An aluminium ring hangs vertically from a thread with its axis pointing east-west. A coil is fixed near to the ring and coaxial with it
What is the initial motion of the aluminium ring when the current in the coil is switched on?
Solution
a
a
Q7.In the circuit shown in Fig, switch S is shifted to position 2 from position 1 at t=0, having been in position 1 for a long time. The current in the circuit just after shifting of switch will be (battery and both the inductors are ideal)
Solution
c
c
Q8. A rectangular loop of slides 10 cm and 5 cm with cut is stationary between the pole pieces of an electromagnet. The magnetic field of the magnet is normal to the loop. The current feeding the electromagnet is reduced so that the field decreases from its initial value of 0.3 T at the rate of0.02 Ts-1. If the cut is joined and the loop has a resistance of 2.0 Ω, the power dissipated by the loop as heat is
Solution
a
a
Q9.A rectangular loop with a sliding connector of length l=1.0 m is situated in a uniform magnetic field B=2T perpendicular to the plane of loop. Resistance of connector isr=2 Ω. Two resistances of 6 and 3 Ω are connected as shown in figure. The external force required to keep the connector moving with a constant velocity v=2m/s is
Solution
c
c
Q10. A gold rod of length l is accelerated in the horizontal direction with an acceleration a0. The rod is held between two perfectly insulating clamps. Calculate the electric filed set up in the rod. Take the mass of electron as m
Solution
a
a
