Current Electricity And Magnetostatics Mock Tests

A current of 2 A flows through a resistor of 10 Ω connected to a battery. The voltage across the resistor is:

A coil of area 0.01 m2 and 100 turns carries a current of 1 A. It is placed in a uniform magnetic field of 0.2 T with its plane perpendicular to the field. The torque on the coil is:

Three resistors of 2 Ω, 4 Ω and 6 Ω are connected in series. The equivalent resistance is:

In a circuit, a 12 V battery is connected in series with two resistors of 4 ohm and 2 ohm. The potential difference across the 4 ohm resistor is:

In a balanced Wheatstone bridge, the ratio of resistances in two adjacent arms is 2:3. If the third arm has resistance 6 Ω, the fourth arm resistance is:

Two long straight parallel wires carry currents I and 2I in the same direction and are separated by distance d. The ratio of magnetic fields at a point midway between the wires due to both wires to the field due to current I alone at that distance is:

A circular coil of radius 0.1 m having 100 turns carries a current of 1 A. The magnetic field at the centre of the coil is (μ₀ = 4π × 10⁻⁷ T·m/A):

An infinite straight wire carries a current of 5 A. The magnetic field at a perpendicular distance of 0.1 m from the wire is (μ₀ = 4π × 10⁻⁷ T·m/A):