Question

the purpose of a rheostat is

(a) increase the magnitude of current only

(b) decrease the magnitude of current only

(c) increase or decrease the magnitude of current

(d) none of these

Answer 1

according to me the answer should be:

option "C".

Answer 2

The 'purpose of a rheostat' is  to "increase or decrease" the 'magnitude of current'.

Answer - (Option C)

Explanation:

• The rheostat is a device which acts like a variable resistor that is used to control the “flow of current” in a circuit.
• Rheostat in Greek means, current controlling device.
• By varying the resistance of the rheostat across the circuit, it adjusts the magnitude of the current without interrupting the flow.
• It works by adjusting the length of the resistance wire that is connected in the circuit.
• Rheostats are used to control the current flow to prevent current faults.