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qUESTIONS

MCQs-PYQs-12th-jee

A metallic rod of mass per unit length 0.5 kg m-1 is lying horizontally on a smooth inclined plane which makes an angle of 30° with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is

MCQs-PYQs-12th-jee

A cylindrical conductor of radius R is carrying a constant current i. The plot of the magnitude of the magnetic field B with distance d from the centre of the conductor is correctly represented by the figure

Three solenoid coils of same dimension, same number of turns and same number of layers of windings are taken. Coil 1 with inductance L was wound using a Mn wire of resistance 11Ω/m, coil 2 with inductance L was wound using the similar wire but the direction of winding was reversed in each layer; coil 3 with inductance L was wound using a superconducting wire. The self inductance of the coils L1,L2,L3 are

MCQs-PYQs-12th-jee

Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. 3 Ampere and 4 ampere are the currents flowing in each coil respectively. The magnetic induction in Weber/m2 at the centre of the coils will be (μ0 = 4π × 10−7 Wb/A-m)

Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt, then

If current in an electric bulb changes by 1%, then the power will change by (a) 1%(b) 2%1000 OF(c) 4% anda darse(d) =%2

Two resistors having equal resistances are joined in series and a current is passed through the combination. Neglect any variation in resistance as the temperature changes. In a given time interval (a) Equal amount of thermal energy must be produced in the resistors(b) Unequal amounts of thermal energy may be produced (c) The temperature must rise equally in the resistors (d) The temperature must rise unequally in the resistors

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current, if it dissipates 22.5 W, the resistance of fuse wire will be

Two wires ‘A’ and ‘B’ of the same material have their lengths in the ratio 1: 2 and radii in the ratio 2: 1. The two wires are connected in parallel across a battery. The ratio of the heat produced in ‘A’ to the heat produced in ‘B’ for the same time is

If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a

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