Current Electricity And Magnetostatics Mock Tests

In a conductor, if the applied electric field is doubled, the drift velocity of electrons and the current density will respectively:

The drift velocity of electrons in a copper wire is directly proportional to:

A charged particle moves into a region of uniform magnetic field perpendicular to its velocity. The kinetic energy of the particle:

A cell of emf 2 V and internal resistance 0.1 Ω is connected to an external resistance of 3.9 Ω. The terminal voltage of the cell 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:

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):

A moving coil galvanometer has a resistance of 50 Ω and gives full scale deflection at a current of 0.01 A. To convert it into a voltmeter with a range of 0–10 V, the resistance that should be connected in series is:

In a meter bridge, the balancing length from the left end is initially 40 cm. If a resistance of 10 Ω is connected in the left gap and the balancing length is found to be 50 cm, the resistance in the right gap is: