Answer:


Explanation:
Given data:
diameter of solenoid is 11.1 cm
B = 42.9 mT
dR = 6.65 mT/s
d(1) = 4.34 cm
d(2) = 7.46 cm
we know that
electric field due to solenoid is given as
E = 1/2 dB/dt (r)


E = 1/2 dB/dt (R^2)/r


I had this question before can you show me the answers choices
Answer:

Explanation:
Given:
Electric Flux = 
Side of sheet = 5cm
Area of the square sheet, A= 5×5 = 25cm²=25×10⁻⁴ m²
Now
the electric flux (Φ) is given as:

where, E = Electric field
or

substituting the values in the above equation, we get


Now the charge density (σ) on a sheet is given as:

where,
= Permittivity of the free space = 8.85×10⁻¹²
substituting the values in the above equation, we get


Answer:
C
Explanation:
Work is the product of force and distance moved in the direction of force . if no distance, no work is done. Holding a heavy object still means no work is done
Answer:
The angle of refraction is option b: 17°.
Explanation:
We can find the angle of refraction by using Snell's law:

Where:
n₁: is the index of refraction of the medium 1 (air) = 1.0003
n₂: is the index of refraction of the medium 2 (diamond) = 2.42
θ₁: is the angle of incidence = 45°
θ₂: is the angle of refraction =?
Hence, the angle of refraction is:


Therefore, the correct option is b: 17°.
I hope it helps you!