Electricity And Magnetism - Study Mode

[#421] A filament of electric bulb draws a current of 0.8A in 5 minutes. Find the amount of electric charge flowing through the circuit.
Correct Answer

(A) 240 C

[#422] Two long wires each carrying a current in the same direction are placed close to each other. Which one of the following statement is correct?
Correct Answer

(A) The wires will attract with each other

Explanation

Solution: Question Explanation: Imagine two parallel wires carrying electricity. The electricity flowing through these wires creates a magnetic field around each wire. The direction of the magnetic field depends on the direction of the current. If the currents in both wires flow in the same direction , their magnetic fields interact in a special way. The magnetic field of one wire will pass through the other wire. This interaction between the magnetic fields causes a force. This force is attractive, meaning the wires pull towards each other. If the currents flowed in opposite directions, the force would be repulsive (they would push each other away). Therefore, when currents are flowing constantly in the same direction in both wires, they will attract each other.

[#423] Electric current is the flow of . . . . . . . .
Correct Answer

(B) Electric charges

[#424] Which one of the following statement is not correct?
Correct Answer

(C) Resistivity of a wire of length I and area of cross-section A depends upon both I and A

[#425] What is the SI unit of electrical resistance?
Correct Answer

(B) Ohm