Related InterviewSolutions

• A simple pendulum with charge bob is oscillating as shown in the figure. Time period of oscillation is `T` and angular ampliltude is `theta`. If a uniform magnetic field perpendicular to the plane of oscillation is switched on, then A. T will decrease but `theta` will remain constantB. T wil remainconstant but `theta` will decreaseC. Both T and `theta` will remain the sameD. Both T and `theta will decrease
• A proton moving with a constant velocity passes through a region of space without any changing its velocity. If `E` and `B` represent the electric and magnetic fields, respectively. Then, this region of space may haveA. `E=0,B=0`B. `E=0, B!=0`C. `E!=0,B=0`D. `E!=0,B!=0`
• In a high tension wire electric current runs from eash to west. Find the direction of magnetic fielsd at points above and below the wire.
• A charged particle of unit mass and unit charge moves with velocity `vecv=(8hati+6hatj)ms^-1` in magnetic field of `vecB=2hatkT`. Choose the correct alternative (s).A. The path of the particle may be `x^2+y^2-4x-21=0`B. The path of the particle may be `x^2+y^2=25`C. The path of the particle may be `y^2+z^2=25`D. The time period of the particle will be 3.14 s
• A long insulated copper wire is closely wound as a spiral of `N` turns. The spiral has inner radius a and outer radius `b`. The spiral lies in the `xy`-plane and a steady current I flows through the wire. The`z`-component of the magetic field at the centre of the spiral is A. `(mu_0NI)/(2(b-a))ln(b/a)`B. `(mu_0NI)/(2(b-a))ln ((b+a)/(b-a))`C. `(m_0NI)/(2b)ln(b/a)`D. `(m_0NI)/(2b)((b+a)/(b-a))`
• Consider a ????cable which consists of an inner wilre of radius `a` surrounded by an outer shell of inner and outer radii `b` and `c` respectively. The inner wire caries a current `I` and outer shell carries an equal and opposite current. The magnetic field at a distance `x` from the axis where `bltxltc` isA. `(mu_0I(c^2-b^2))/(2pix(c^2-a^2))`B. `(mu_0I(c^2-x^2))/(2pix(c^2-a^2))`C. `(mu_0I(c^2-x^2))/(2pix(c^2-b^2))`D. zero
• A circular loop of radius `R` carries current `I_2` in a clockwise direction as shown in figure. The centre of the loop is a distance `D` above a long, straight wire. What are the magnitude and direction of the current `I_1` in the wire if the magnetic field at the centre of loop is zero?
• A segment `AB` of wire carrying current `I_1` is placed perpendicular to a long straight wire carrying current `I_2` as shown in figure. The magnitude of force experieced by the straight wire `AB` is A. `(mu_0I_1I_2)/(2pi)ln 3`B. `(mu_0I_1I_2)/(2pi) ln 2`C. `(2mu_0I_1I_2)/(2pi)`D. `(mu_0I_1I_2)/(2pi)`
• Two long mutually perpendicular conductors carrying currents `I_1` and `I_2` lie in one plane, Find the locus of points at which the magnetic induction is zero.
• A conductor consists of a circular loop of radius `R =10 cm` and two straight, long sections as shown in figure. The wire lies in the plane of the paper and carries a current of `i = 7.00 A` Determine the magnitude and direction of the magnetic field at the centre of the loop.