Author Question: The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate ... (Read 69 times)

soccerdreamer_17 · **on:** Jul 29, 2018

The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW.

The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?
A) The power increases to 2.2 kW. B) The power is still 2.0 kW.
C) The power decreases to 1.8 kW. D) None of the given answers is correct.

Question 2

A beam of electrons is accelerated through a potential difference of 1.0 kV before entering a velocity selector. If the magnetic field of the velocity selector has a magnitude of 0.010 T,

what magnitude of the electric field is required if the electrons are not to be deflected as they pass through the velocity selector? ((e = 1.60 10-19 C, melectron = 9.11 10-31 kg)
A) 5.9 103 V/m
B) 6.0 105 V/m
C) 7.2 106 V/m
D) 1.9 105 V/m
E) 1.1 105 V/m