The correct answer is (C) 4π × 10⁻³T. The magnetic field inside a solenoid is given by B = μ0nI, where μ0 = 4π × 10⁻⁷T⋅ m/A,n = 1000 turns/m and I = 5A, giving B = 4π × 10⁻³T.
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The correct answer is (C) 4B. Magnetic induction at the center of a circular coil with n turns is given by B′ = n² B. For two turns (n=2), the magnetic induction becomes B′ = 2²B = 4B, quadrupling the ...
The correct answer is (D) 6 A in the clockwise direction. To nullify the magnetic field at the common center, the magnetic fields produced by both loops must be equal and opposite. Using the ratio of radii and currents, loop ...
In a parallel circuit, power P = V²/R. Since both resistors have the same voltage, the thermal energy ratio is inversely proportional to resistance. Thus, E100Ω : E 200Ω = 200 : 100 = 2:1. Answer: (b) 2:1.
Using the formula for parallel battery circuits: V = 12/1 + 13/2 /1/1 + 1/2 = 12 + 6.5/1.5 = 11.67V Thus, the answer is (a) 11.6 V to 11.7 V.