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qUESTIONS

MCQs-PYQs-12th-jee

A square current-carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is F, the net force on the remaining three arms of the loop is

MCQs-PYQs-12th-jee

A current carrying closed loop in the form of a right angle isosceles triangle ABC is placed in a uniform magnetic field acting along AB. If the magnetic force on the arm BC is vector F the force on the arm AC is

MCQs-PYQs-12th-jee

A closely wound solenoid of 2000 turns and area of cross-section 1.5×10^–4 m^2 carries a current of 2.0 A. It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field 5×10^–2 tesla making an angle of 30 with the axis of the solenoid. The torque on the solenoid will be

MCQs-PYQs-12th-jee

A rectangular coil of length 0.12m and width 0.1m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 Weber/m^2. The coil carries a current of 2A. If the plane of the coil is inclined at an angle of 30 with the direction of the field, the torque required to keep the coil in stable equilibrium will be

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)

MCQs-PYQs-12th-jee

A particle with charge Q, moving with a momentum p, enters a uniform magnetic field normally. The magnetic field has magnitude B and is confined to a region of width d, where d less than p/BQ.The particle is deflected by an angle θ in crossing the field.

MCQs-PYQs-12th-jee

A proton accelerated by a potential difference V = 500 kV flies through a uniform transverse magnetic field with induction B = 0.51 T. The field occupies a region of space d =10 cm in thickness. Find the angle a through which the proton deviates from the initial direction of its motion.

MCQs-PYQs-12th-jee

A long wire A carries a current of 10 amp. Another long wire B, which is parallel to A and separated by 0.1 m from A, carries a current of 5 amp. in the opposite direction to that in A. What is the magnitude and nature of the force experienced per unit length of B

MCQs-PYQs-12th-jee

A stream of electrons is projected horizontally to the right .A straight conductor carrying a current is supported parallel to the electron stream and above it. If the current in the conductor is from left to right, what will be the effect on the electron stream?

MCQs-PYQs-12th-jee

Three long straight wires A, B and C are carrying currents as shown in figure. Then the resultant force on B is directed :

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