CBSE Class 10 Physics Tungsten Assignment

1. Why tungsten is used exclusively for filaments of electric bulbs?

2. When you break a bar magnet in half, how many poles does each piece have?

3. Which of the compass-needle orientations in the figure below might correctly describe the magnet’s field at that point?

4. A 9.0 V battery is connected to four light bulbs, as shown at right. Find the equivalent resistance for the circuit and the current in the circuit.

5. A series combination of two resistors, 7.25 Ω and 4.03 Ω, is connected to a 9.00 V battery.

a. Calculate the equivalent resistance of the circuit and the current.

b. What is the potential difference across each resistor?

6. A length of wire is cut into five equal pieces. The five pieces are then connected in parallel, with the resulting resistance being 2.00 Ω. What was the resistance of the original length of wire before it was cut up?

7. Write any three applications of heating effect of electric current?

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