Physics
In the combinations of resistors shown below. calculate:
(a) the resistance across AB when the switch S is open.
(b) the resistance across AB when the switch S is closed.
Related Questions
Bulb A rated 160 W, 40 V and Bulb B rated 40 W, 40 V are connected as shown in the diagram.
(a) Calculate the ratio V1 : V2.
(b) If the bulb A fuses, the current in the circuit remains the same. State True or False.
The reverse side of a three-pin plug with incorrect connection of wires is shown in the diagram below.
(a) Identify the fault in the above connection.
(b) Mention a risk factor involved, if the user operates the appliance without correcting it.
(c) Will the appliance function in the present situation? (Yes or No)
An electric iron rated 1100 W, 220 V is operated for 5 hours.
Calculate:
(a) the minimum rating of the fuse required.
(b) the energy consumed in kWh.
(c) the cost of the energy consumed, if the rate is ₹ 10 per unit.
When the magnet as shown in the diagram, is moved towards the coil at a speed of 5 m s-1, the galvanometer shows a certain deflection to the right.
How will the direction and magnitude of deflection change when the coil also moves with a speed of 5 m s-1:
(a) in the direction of the motion of the magnet?
(b) in the opposite direction of the motion of the magnet?