Magnetic Effects & EMI Mock Tests

A long straight wire carries current I. A square loop of side a carrying current I is placed at distance d from the wire with its plane coplanar with the wire. The net force on the loop is:

A long straight wire carries current I. A rectangular loop of sides a and b (a parallel to the wire) is placed at distance r from the wire in the same plane. The loop is pulled away from the wire with constant velocity v. The induced EMF in the loop is:

A particle of mass m and charge q enters a region of uniform magnetic field B with velocity v perpendicular to B. The particle moves in a circular path of radius R. If the charge is doubled and the mass is halved, the new radius of the circular path is:

A long solenoid has n turns per unit length and carries current I. A circular loop of radius R and resistance R_res is placed coaxially inside the solenoid. If the current in the solenoid increases at a constant rate dI/dt, the induced current in the loop is:

An electron and a proton enter a uniform magnetic field perpendicularly with the same kinetic energy. The ratio of the radii of their circular paths r_e/r_p is (mass of electron = m_e, mass of proton = m_p, charge magnitude = e):

A conducting rod of length L moves with velocity v perpendicular to a uniform magnetic field B. The rod is part of a circuit with resistance R. The power dissipated in the resistor when an external force F pulls the rod at constant velocity is:

A series LCR circuit has L = 4 H and C = 25 μF. The resonant frequency of the circuit is:

A conducting rod of length L slides without friction on horizontal conducting rails connected by a resistor R. A uniform magnetic field B is directed vertically downward. The rod is pulled by a constant force F. The terminal velocity of the rod is: