Physics-
General
Easy
Question
For a positively charged particle moving in a x-y plane initially along the x-axis, there is a sudden change in its path due to the presence of electric and/or magnetic fields beyond P. The curved path is shown in the x-y plane and is found to be non-circular. Which one of the following combinations is possible
The correct answer is:
Electric field can deviate the path of the particle in the shown direction only when it is along negative y-direction. In the given options is either zero or along x-direction. Hence it is the magnetic field which is really responsible for its curved path. Options (a) and (c) can’t be accepted as the path will be helix in that case (when the velocity vector makes an angle other than 0°, 180° or 90° with the magnetic field, path is a helix) option (d) is wrong because in that case component of net force on the particle also comes in k direction which is not acceptable as the particle is moving in x-y plane. Only in option (b) the particle can move in x-y plane.
In option (d) :
Initial velocity is along x-direction. So let
\
In option (b)
Related Questions to study
physics-
A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction
A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction
physics-General
physics-
An infinitely long conductor PQR is bent to form a right angle as shown. A current I flows through PQR The magnetic field due to this current at the point M is H1. Now another infinitely long straight conductor QS is connected at Q so that the current is I/2 in QR as well as in QS, The current in PQ remaining unchanged. The magnetic field at M is now The ratio is given by
An infinitely long conductor PQR is bent to form a right angle as shown. A current I flows through PQR The magnetic field due to this current at the point M is H1. Now another infinitely long straight conductor QS is connected at Q so that the current is I/2 in QR as well as in QS, The current in PQ remaining unchanged. The magnetic field at M is now The ratio is given by
physics-General
physics-
A cell is connected between the points A and C of a circular conductor ABCD of centre O with angle A. If and are the magnitudes of the magnetic fields at O due to the currents in ABC and ADC respectively, the ratio is
A cell is connected between the points A and C of a circular conductor ABCD of centre O with angle A. If and are the magnitudes of the magnetic fields at O due to the currents in ABC and ADC respectively, the ratio is
physics-General
physics-
The magnetic field at the centre of a circular coil of radius r is times that due to a long straight wire at a distance r from it, for equal currents. Figure here shows three cases : in all cases the circular part has radius r and straight ones are infinitely long. For same current the B field at the centre P in cases 1, 2, 3 have the ratio
The magnetic field at the centre of a circular coil of radius r is times that due to a long straight wire at a distance r from it, for equal currents. Figure here shows three cases : in all cases the circular part has radius r and straight ones are infinitely long. For same current the B field at the centre P in cases 1, 2, 3 have the ratio
physics-General
physics-
The voltage gain of the following amplifier is
The voltage gain of the following amplifier is
physics-General
physics-
The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4W. Find the current in the wire AB if the switch S is closed
The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4W. Find the current in the wire AB if the switch S is closed
physics-General
physics-
A pair of parallel conducting rails lie at right angle to a uniform magnetic field of 2.0 T as shown in the fig. Two resistors 10 and 5 are to slide without friction along the rail. The distance between the conducting rails is 0.1 m. Then
A pair of parallel conducting rails lie at right angle to a uniform magnetic field of 2.0 T as shown in the fig. Two resistors 10 and 5 are to slide without friction along the rail. The distance between the conducting rails is 0.1 m. Then
physics-General
physics-
Two coils P and Q are placed co-axially and carry current I and I' respectively
Two coils P and Q are placed co-axially and carry current I and I' respectively
physics-General
physics-
An alternating voltage of 141.4V (rms) is applied to a vacuum diode as shown in the figure. The maximum potential difference across the condenser will be
An alternating voltage of 141.4V (rms) is applied to a vacuum diode as shown in the figure. The maximum potential difference across the condenser will be
physics-General
physics-
The diagram of a logic circuit is given below. The output F of the circuit is represented by
The diagram of a logic circuit is given below. The output F of the circuit is represented by
physics-General
physics-
The shows two NAND gates followed by a NOR gate. The system is equivalent to the following logic gate
The shows two NAND gates followed by a NOR gate. The system is equivalent to the following logic gate
physics-General
physics-
The combination of gates shown below produces
The combination of gates shown below produces
physics-General
physics-
Figure gives a system of logic gates. From the study of truth table it can be found that to produce a high output (1) at R, we must have
Figure gives a system of logic gates. From the study of truth table it can be found that to produce a high output (1) at R, we must have
physics-General
physics-
The following configuration of gate is equivalent to
The following configuration of gate is equivalent to
physics-General
physics-
For the transistor circuit shown below, if , voltage drop between emitter and base is 0.7 V then value of will be
For the transistor circuit shown below, if , voltage drop between emitter and base is 0.7 V then value of will be
physics-General