Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202430 Jan 2024Morning ShiftPhysicsCurrent ElectricityActual

An electric toaster has resistance of 60 Ω at room temperature 27 ° C . The toaster is connected to a 220 V supply. If the current flowing through it reaches 2 . 75 A , the temperature attained by toaster is around: (if α = 2 × 10 - 4 C - 1 ∘ )

Options

  1. A694 ° C
  2. B1235 ° C
  3. C1694 ° C
  4. D1667 ° C

Correct answer

C. 1694 ° C

Step-by-step solution

Resistance at 27 ° C , R T = 27 = 60 Ω . Final resistance, R T = 220 2 . 75 = 80 Ω . Now, we can write R = R 0 ( 1 + α Δ T ) ⇒ 80 = 60 1 + 2 × 10 - 4 ( T - 27 ) ⇒ T ≈ 1694 ° C

Practice Current Electricity on Quantrex Academy →

More from Current Electricity

A metal wire of cross-sectional area 0.5 mm ^2 and length 100 m is connected across a battery of e.m.f. 2 V and internal resistance 1 . The density, atomic mass and electrical cond 2026As shown in the figure, the resistance of a galvanometer G can be found by the half-deflection method. Here the resistance R₂ is adjusted such that when the key K is closed the def 2026The stored charge in the capacitor in steady state of the following circuit is ________ C. 2026A moving coil of galvanometer when shunted with 2 , resistance gives a full scale deflection for a current of 500 mA. When a resistance of 470 , is connected in series it gives a f 2026Two cells of emfs 1 V and 2 V and internal resistance 2 , and 1 , , respectively connected in parallel, gave a current of 1 A through an external resistance. If the polarity of one 2026Refer to the circuit diagram given below. The heat generated across the 6 , resistance in 100 second is 100 J. The value of is _______. (Nearest integer) 2026In an experiment to determine the resistance of a given wire using Ohm's law, the voltmeter and ammeter readings are noted as 10 V and 5 A , respectively. The least counts of voltm 2026Under steady state condition the potential difference across the capacitor in the circuit is _______ V. 2026 Full Current Electricity list All JEE Main PYQs