An electron is moving west in a region where the magnetic field is east. The mag
ID: 1408465 • Letter: A
Question
An electron is moving west in a region where the magnetic field is east. The magnetic force exerted on the electron is: A) zero B) up C) down D) east E) west 11. If the potential difference across a resistor is doubled: A) only the resistance is doubled: A) only the resistance is doubled B) only the current is doubled C) both the current and resistance are doubled D) both the current and resistance keep the same E) None of the above 12. A proton moving along the +x-axis enters a magnetic field. If it experiences a magnetic deflection in the -z direction, then the magnetic field must have a component A) along the +z-axis B) along the -z-axis C) along the -x-axis D) along the +y-axis E) along the -y-axis 13. Faraday's law states that an induced emf is proportional to: A) the rate of change of the magnetic field B) the rate of change of the electric field C) the rate of change of the magnetic flux D) the rate of change of the electric flux 14. Two long parallel straight wires carry equal currents in the same direction. At a point midway between the wires, the magnetic field they produce is: A) non-zero and parallel to the wires B) non-zero and along a line connecting the wires C) zero D) non-zero and perpendicular to the plane of the two wires E) none of the above 15. The Four wires meet at a junction. The first carries 8 A into the junction, the second carries 6 A into the junction, and the third carries 5 A out of the junction. The fourth carries: A) 9A out of Ihe junction. B) 9A into the junction. C) 3A out of the junction. D) 3A into the junction..Explanation / Answer
According to the given problems,
10) Answer: A,
As velocity of electron and magnetic field are parallel to each other in opposite directions.
11) Answer: B,
According to ohm`s law voltage is directly popartional to current.
12) Answer: B
It is due to the magnetic diflaction in z direction.
13) Answer: C
Faraday's second law of electro magnetic induction
The magnitude of emf induced in a closed circuit is directly proportional to the rate of change of magnetic flux linked with the circuit.
14) Answer: D
Non- Zero as the field due to current in same directions add each other out. and direction is perpendicular
15) Answer : A
Sum of the current at the node = 0 (in is the + direction)
I1 + I2 - I3 + I4 = 0
I4 = - 9A [Out of the juction]
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