Magnetic Effects & EMI Mock Tests

An AC circuit contains a resistor R and an inductor L in series. The impedance is Z and the power factor is cos(phi). If the frequency is doubled, the new power factor becomes:

A solenoid of length 0.5 m has 500 turns and carries a current of 2 A. The magnetic field at its center is: (μ₀ = 4π × 10⁻⁷ T·m/A)

A charged particle moves in a uniform magnetic field B perpendicular to its velocity v. If the mass is m and charge is q, the time period of revolution is:

A particle of mass m and charge q is projected with velocity v into a uniform magnetic field B perpendicular to its velocity. The radius of the circular path and the time period of revolution are respectively:

A circular coil of radius 10 cm has 100 turns. The magnetic field at the center when 1 A current flows is: (μ₀ = 4π × 10⁻⁷ T·m/A)

An EM wave traveling in vacuum has electric field E = E₀ sin(kx - ωt). The magnitude of the magnetic field is:

A long solenoid of radius R has n turns per unit length and carries current I. A second coaxial solenoid of radius 2R has n/2 turns per unit length and carries current I in the opposite direction. The magnetic field at a distance r = R/2 from the axis inside both solenoids is:

A circular loop of radius R carrying current I is placed in a uniform magnetic field B perpendicular to its plane. The tension in the loop is: