Category: PHY102 0 PHY102 1 / 50 Â Find the current in through the $0.3Omega$ in the circuit shown 0.69A 3.27A 1.33A 2.15A 2 / 50 A uniform electric field of 200 N/C is in the x-direction. A point charge of 3mu{C} is released from rest at the origin. What is the kinetic energy of the charge when it is at x = 4 m? 1.6$\times10^{-2}$ J 2.4$\times10^{-2}$ J 4.8$\times10^{-2}$ J 3.6$\times10^{-2}$ J 3 / 50 A proton is accelerated through a potential difference of 100V and the enters a region in which it is moving perpendicular to a magnetic field of flux density 0.20 T. Find the radius of the circular path in which it will travel. 0.5 km 0.7 km 0.3 km 0.9 km 4 / 50 The magnitude of the forces between charged spheres was first investigated by Charles --------------------------- Check 5 / 50 For capacitors in parallel, the potential difference across each capacitor is --------------------------- Check 6 / 50 Find the force on a charge 2C in a field 1Vm<sup>-1</sup>--------------------------- Check 7 / 50 Â An ammeter is suspected of giving inaccurate readings. In order to confirm the readings, the ammeter is connected to a silver votltameter in series and a steady current is passed for one hour. The ammeter reads 0.56A and 2.0124g of silver is deposited. What is the error is the ammeter reading? 6.0A 0.06A 0.11A 1.1A 8 / 50 Â Which of the following is a conductor glass plastic silk copper 9 / 50 A region where an electric charge experiences a force is ---------------------------field Check 10 / 50 When an atom is in the ground state it is said to be --------------------------- Check 11 / 50 Â An ac circuit consists of a voltage source $v = 200sin120pi{t}$ and a $6mu$F capacitor in series. Calculate the current established in the circuit 0.64A 0.32A 1.24A 2.13A 12 / 50 When a charge density depends only on the perpendicular distance from a plane, the charge distribution is said to have--------------------------- symmetry. Check 13 / 50 Â Two charges $Q_{1} = 500mu{C}$ and $Q_{2} = 100mu{C}$ are located on the XY plane at the positions $r_{1} = 3vec{j} m and r_{2} = 4vec{i}$ m. Find the force exerted on the $Q_{2}$ $14.4\vec{i} â€“ 10.8\vec{j}$ N $14.4\vec{i} + 10.8\vec{j}$ N $10.8\vec{i} + 14.4\vec{j}$ N $10.8\vec{i} â€“ 14.4\vec{j}$ N 14 / 50 Â A series circuit consisting of an uncharged $42mu$F capacitor and $10 MOmegaega$ resistor is connected to 100V power source. What are the current in the circuit and the charge on the capacitor after one time constant? $1.3\mu$A and $52\mu$C $7.2\mu$A and $100\mu$C $4.6\mu$A andC 221\mu$C $3.7\mu$A and $126\mu$C 15 / 50 According to ohm's law the potential difference is proportional to the --------------------------- Check 16 / 50 Â If the steady current in a wire is coming directly toward you, the magnetic field lines point radially outward circle the wire in the counterclockwise direction point radially inward circle the wire in the clockwise direction 17 / 50 Electric field is measured in Newton per ---------------------------. Check 18 / 50 Â In the circuit shown, each of the cells has an emf of 2V and internal resistance of $0.1Omega$. Find the current in through the $0.5Omega$ 0.13A 2.44A 3.45A 1.27A 19 / 50 A positive ion passes through an electric and magnetic fields which are mutually perpendicular. The electric field strength is 20.0kV/m while the magnetic flux density is 0.40T. At what speed will the ion pass through undeflected? $5.0\times10^{4}$m/s $8.0\times10^{4}$m/s $6.0\times10^{4}$m/s $7.0\times10^{4}$m/s 20 / 50 Potential difference is the work done in moving a unit charge ____ from one point to another in an electric field. Check 21 / 50 In the method of charging by friction, The algebraic sum of the individual charges that is the net charge is ---------------------------. Check 22 / 50 The principle that electric forces add vectorially is known as the principle of --------------------------- Check 23 / 50 Â A rectangular coil of dimensions 20 cm by 15 cm lies with its plane parallel to a magnetic field of $ 0.5 W/$m^{2}$. The coil, carrying a current of 10 A experiences a torque of 4.5 Nm in the field. How many loops has the coil? 20 60 30 100 24 / 50 A positively charged object repels neutral objects both positively and negatively charged objects negatively charged objects positively charged object 25 / 50 The direction of the electric field is opposite to that of the force if the charge is --------------------------- Check 26 / 50 The resistivity of a semiconductor decreases rapidly with increasing ---------------------------. Check 27 / 50 Three point charges $$2mu{C$}, ${-}4mu{C}$$, and $$6mu{C}$$ are held at the corners of an equilateral triangle with sides equal to 3 cm.What is the resultant force in newtons on the $$2mu{C}$$ charge? ${-}40\vec{i}+63.7\vec{j}$ ${-}80\vec{i}+69.3\vec{j}$ $80\vec{i}-69.3\vec{j}$ $40\vec{i}-63.7\vec{j}$ 28 / 50 Â Kirchhof's loop rule is statement of conservation of __________ charge mass energy momentum 29 / 50 Â Which of the following is not true about the electric field intensity $vec{E}$ of a uniformly charged solid sphere? $ $\vec{E}$ is directly proportional to the distance from the centre of the sphere $$\vec {E}$$ decreases as a square of the distance from the centre of the sphere. $\vec{E}$$decreases as a square of the distance from the surface of the sphere $$\vec{E}$$ is maximum at the surface of the sphere 30 / 50 The force that is responsible for holding electrons to nuclei to form atoms is called the --------------------------- force Check 31 / 50 The work done in taking a unit positive charge from one point to another in electric field is --------------------------- of the path chosen between the two points. Check 32 / 50 1eV is the energy acquired by an electron in falling freely through --------------------------- 1volt. Check 33 / 50 Â A single turn coil of cross-sectional area $7.2cm^2$ is in the a magnetic field of flux desity 0.45T. The field which is perpendicular to the coil, is steadily reduced to 0.0T in 5s. Calculate the induced emf. $0.65\mu$V $0.47\mu$V $0.72\mu$V $0.52\mu$V 34 / 50 When a dielectric material is inserted between the plates of a capacitor it increases its --------------------------- Check 35 / 50 A body that absorbs all radiations falling on it is known as ---------------------------. Check 36 / 50 The minimum energy required to liberate an electron from a metal surface is called ---------------------------. Check 37 / 50 Â A huge spark due to electric discharge in the atmosphere produces all of the following except ______ shock waves Lightning gamma radiation. Rapid expansion of surrounding air 38 / 50 An alpha particle is a --------------------------- nucleus consisting of 2 protons and 2 neutrons. Check 39 / 50 When a copper surface is illuminated by radiation of wavelength 2537 angstrome units the value of the stopping potential is found to be 0.24volts. Calculate the work function of copper. 4.48eV 3.26eV 2.67eV 7.46eV 40 / 50 As charge increases, electric flux density Â--------------------------- Check 41 / 50 Â A conductor 2cm long carrying a current of 8A lies at right angles to a magnetic field of which the flux density is 1.0T. Calculate the force exerted on the conductor 0.45N 0.16N 0.25N 0.20N 42 / 50 A galvanometer of resistance $120Omega$ a full scale deflection with a current of 0.0005A. How would you convert it to an ammeter that reads a maximum current of 5A? connect $0.012\Omega$ in parallel to it connect $20.10\Omega$ in series to it connect $200.12\Omega$ in series to it connect $2000\Omega$ in parallel to it 43 / 50 Â From Gaussâ€™ law which of the following is NOT correct? The outward flux of electric field through an enclosed surface is proportional to the electric charges enclosed The electric flux through a Gaussian surface is a vector product of the electric field and a unit vector perpendicular to and outward from the surface The field at a point outside a spherically symmetric charge is the same as the electric field at the same point due to a point charge at its centre. The total electric flux through a cylinder placed in an electric field with its axis parallel to the field is zero 44 / 50 When amber is rubbed with fur amber is negatively charged while fur is positively charged amber is positively charged while fur is neutral amber is positively charged while fur is negatively charged amber is negatively charged while fur is neutral 45 / 50 A tiny ball of mass 0.60 g is suspended from a rigid support with a piece of thread in a horizontal electric field of intensity 700 N/C. The ball is in equilibrium when the thread is inclined at an angle of 20_{o} to the vertical. What are the magnitude and sign of the charge on the ball? Take g = 9.8m/s^{2} $3.2\times10^{-6}$ C ${-}3.1\times10^{-6}C ${-}4.1\times10^{-3}$C $4.2\times10^-{6}$ C 46 / 50 Which of the following is not true of an electrostatic force? it is mutually attractive or repulsive it obeys an inverse square law it acts along the line joining the point charges it is weaker than the gravitational attraction between the charged particles. 47 / 50 Â An air-cored transformer is assumed to be 100% efficient. The ratio of the secondary turns to the primary turns is 1:20. A 240V ac supply is connected to the primary coil and a $6Omega$ load is connected to the secondary coil. what is the current in the primary coil? 40.0A 0.14A 0.10A 2.0A 48 / 50 The --------------------------- number is the total number of neutrons and protons. Check 49 / 50 The following are true about electric field lines except that they ______ give the direction of motion of a unit positive test-charge under the action of the electrostatic force are drawn such that the magnitude of the field is proportional to the number of lines crossing a unit area perpendicular to the lines do not intersect one another are discontinuous and may terminate in a vacuum 50 / 50 Â An electron enters a uniform magnetic field 0.20 T at an angle of $30^{o}$ the field. Determine the pitch of the helical path assuming its speed is $3times10^{7}$ m/s 90.6 m 46.5 m 56.1 m 37.8 m Restart quiz Rate this quiz Send feedback