0
question_answer1) A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10 A. The magnetic field (in Tesia) at point O will be
question_answer2) A particle having the same charge as of electron moves in a circular path of radius 0.5 cm under the influence of a magnetic field of 0.5T. If an electric field of 100 V/m makes it to move in a straight path then the mass (in kg) of the particle is (Given charge of electron \[=1.6\times {{10}^{-19}}C)\]
question_answer3) A galvanometer having a resistance of \[20\Omega \] and 30 division on both sides has figure of merit 0.005 ampere/division. The resistance (in ohms) that should be connected in series such that it can be used as a voltmeter upto 15 volt, is:
question_answer4) The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the loop is \[{{B}_{1}}\]. When the dipole moment is doubled by keeping the current constant, the magnetic field at the centre of the loop is \[{{B}_{2}}\]. The ratio \[\frac{{{B}_{1}}}{{{B}_{2}}}\] is:
question_answer5) In an experiment, electrons are accelerated, from rest, by applying a voltage of 500 V. Calculate the radius (in metre) of the path if a magnetic field 100 mT is then applied. [Charge of the electron \[=\text{ }1.6\times {{10}^{-19}}\text{ }C\] Mass of the electron\[~=\text{ }9.1\times {{10}^{-31}}kg]\]
question_answer6) A galvanometer, whose resistance is 50 ohm, has 25 divisions in it. When a current of \[4\times {{10}^{4}}\] A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, it should be connected to a resistance of (in ohm)
question_answer7) A rectangular coil \[\left( Dimension\text{ }5\text{ }cm\times 2.5\text{ }cm \right)\]with 100 turns, carrying a current of 3 A in the clock-wise direction, is kept centered at the origin and in the X - Z plane. A magnetic field of 1 T is applied along X - axis. If the coil is tilted through \[45{}^\circ \] about Z - axis, then the torque (in Nm) on the coil is:
question_answer8) A moving coil galvanometer has resistance \[50\,\,\Omega \]and it indicates full deflection at 4 mA current. A voltmeter is made using this galvanometer and a \[5\,\,k\,\,\Omega \] resistance. The maximum voltage (in V), that can be measured using this voltmeter, will be
question_answer9) An electron accelerated by a potential difference \[F=\text{ }1.0\text{ }kV\] moves in a uniform magnetic field at an angle \[\alpha =30{}^\circ \] to the vector \[\overrightarrow{B}\] whose modulus is \[B\text{ }=\text{ }29\text{ }mT.\] Find the pitch (in cm) of the helical trajectory of the electron.
question_answer10) A wire ABCD is bent in the form shown here in the figure. Segments AB and CD are of length 1 m each while the semicircular loop is of radius 1 m. A current of 5 A flows from A towards the end D and the whole wire is placed in a magnetic field of 0.5 T directed out of the page. The force (in newton) acting on the wire is:
question_answer11) The resistance of a galvanometer is 50 ohm and the maximum current which can be passed through it is 0.002 A. What resistance (in ohm) must be connected to it order to convert it into an ammeter of range 0 - 0.5 A?
question_answer12) The magnitude of the magnetic field \[(in\,\mu T)\] at the center of an equilateral triangular loop of side 1 m which is carrying a current of 10 A is : \[[Take{{\mu }_{0}}=4\pi \times {{10}^{-7}}N{{A}^{-2}}]\]
question_answer13) A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of \[40\pi \,\,red\,\,{{s}^{-1}}\] about its axis, perpendicular to its plane. If the magnetic field at its centre is \[3.8\times {{10}^{-9}}T,\] then the charge (in coulomb) carried by the ring is close to \[({{\mu }_{0}}=4\pi \times {{10}^{-7}}\,N/{{A}^{2}})\].
question_answer14) Find the magnetic field (in Tesia) at point P due to a straight line segment AB of length 6 cm carrying a current of 5 A. (See figure) \[({{\mu }_{0}}=4\pi \times {{10}^{-7}}N-{{A}^{-2}})\]
question_answer15) A 200 - turn solenoid having a length of 25 cm and a diameter of 10 cm carries a current of 0.30 A. Calculate the magnitude of the magnetic field \[\overrightarrow{B}\] (in mT) inside the solenoid.
Please Wait you are being redirected....
You need to login to perform this action.You will be redirected in 3 sec
OTP has been sent to your mobile number and is valid for one hour
Your mobile number is verified.
