An electron is accelerated through potential difference of 150 V from rest and t

Question

An electron is accelerated through potential difference of 150 V from rest and then enters a region of uniform magnetic field travelling perpendicular to the field. The magnitude of magnetic field is 0.50 T. a) What is the magnitude of magnetic force acting on the electron (5.8 times 10^-14 N), and b) what is the radius of the path? (8.3 times 10^-3) A flashlight bulb operating at a voltage of 4.5 V has a resistance of 8.0 W. How many electrons pass through the bulb filament per second (e = 1.6 times 10^-19 C)?(3.5 times 10^18) A resistor is connected to a battery with negligible internal resistance. If you replace the resistor with one that has twice the resistance, by what factor does the power dissipated in the circuit change? (0.5) If a lamp has resistance of 120 ohm when it operates at 100 W, what is the applied voltage? (110 V) Resistors of values 8.0 ohm, 12.0 ohm, and 24.0 ohm are connected in series across a battery with a small internal resistance. Which resistor dissipates the greatest power? (24.0 W) An electron moves through a region of crossed electric and magnetic fields. The electric field E = 2000 V/m and is directed straight down. The magnetic field B = 0.80 T and is directed to the left. For what velocity v of the electron into the paper will the electric force exactly cancel the magnetic force? (2500 m/s) A current-carrying wire of length 50 cm is positioned perpendicular to a uniform magnetic field. If the current is 10.0 A and it is determined that there is a resultant force of 3.0 N on the wire due to the interaction of the current and field, what is the magnetic field strength? (0.60 T)

Explanation / Answer

(8). 8 ohm,12 ohm and 24 ohm are conneted in series with a battery of small internal resistance.

In series combination , the current is ame in all resistors.

Power P = i 2 R

Current is same in all resistors.

So, power dissipated is directly proportional to resistance that means resistance of the resisitor is maximum then power dissipated is also maximum in that resistor.

In our problem,maximum resistance is 24 ohm

Therefore answer is 24 ohm

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