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The field lines make an angle of 60º with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.
An electron is shot into the field with a speed of 4.8 × 106 m s-1 normal to the field. Explain why the path of the electron is a circle. Determine the radius of the circular orbit. (e = 1.6 &t
How do the phase angle and current change as the resistance changes in a circuit where the frequency stays constant? How do these results differ from those in the case where the resistance stays the
The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30º with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitu
Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A.
A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the wire?
What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30º with the direction of a uniform magnetic field of 0.15 T?
An automatic external defibrillator delivers 125J of energy at a voltage of 1050V. What is the capacitance of this device?
At time t = 0 the point at x = 0 has a displacement of 0 and is moving in the +y direction. Find the phase constant of this wave.
How much kinetic energy Kair did the air molecules gain from the falling coffee filter? The temperature change of the coffee filter is negligible.
What is the angular frequency of the charge oscillations in the capacitor after the switch is closed?
A horizontal spring-mass system has low friction, spring stiffness 185 N/m, and mass 0.3 kg. The system is released with an initial compression of the spring of 9 cm and an initial speed of the mass
The top of a tower much like the leaning bell tower at Pisa, Italy, moves toward the south at an average rate of 1.5 mm/y. The tower is 51 m tall. In radians per second, what is the average angular
Taking the water as the system, what was the energy change of the surroundings?
How much current would the inductor mentioned in part A have to carry to store 0.90 J of energy?
As the chain is raised, assuming that the motor supplies a constant force, describe in a sentence or two how the motion of the anchor changes. Sketch a rough position versus time and velocity versus
A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?
The balance point of the cell in open circuit is 76.3 cm. When a resistor of 9.5 Ω is used in the external circuit of the cell, the balance point shifts to 64.8 cm length of the potentiometer
Determine the value of X. What might you do if you failed to find a balance point with the given cell of emf ??
A secondary cell after long use has an emf of 1.9 V and a large internal resistance of 380 Ω . What maximum current can be drawn from the cell? Could the cell drive the starting motor of a car?
In a potentiometer arrangement, a cell of emf 1.25 V gives a balance point at 35.0 cm length of the wire. If the cell is replaced by another cell and the balance point shifts to 63.0 cm, what is the
What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?
A which settles after a few seconds toa steady value of 2.8 A. What is the steady temperature of the heating element if the room temperature is 27.0 °C? Temperature coefficient of resistance of
What is the resistivity of the material at the temperature of the experiment?