Fle Edt Vie Windo Help Tools F 1. Ohm\'s law is not: (A)V-IR (B)I-VR (C)R-VI (D)

Question

Fle Edt Vie Windo Help Tools F 1. Ohm's law is not: (A)V-IR (B)I-VR (C)R-VI (D)R-VI 2. If a 10V battery is connected across a coil of resistance of 5, what is the curren the coil? (A) 2A (B) 5A (C) 50A (D) 10A (E) 2. 3. A wire of resistance R has been stretched to N times as its original length. What new resistance of the wire? (Hint: Volume of the wire remains constant) (A) R (B) RN C) NR (D) N2R (E) Two wires "A" & "B" of same materials and length L and 2L have radiu respectively. If the resistance of wire "A" equals to R, what is the resistance of 4. (A) R (B) 2R (C) R 2 (D)4R 5. When a battery of 1.5 V is connected to a wire of 5 m having cross sectional 10 m2, 0.75 A current flowing through it. Resistivity of the wire is (A) 1 x 107 (B) 2.5 × 107 (C) 5 x 107 (D) 1

Explanation / Answer

1. ohm Law: V = I R

I = V / R and R = V / I

Ans(C)

2. I = V /R = 10 / 5 = 2 A

Ans(A)

3. R = rho L / A

L A = constant

L A = L' A' = (N L )(A')

A' = A/N

R' = rho L' / A' = rho N L / (A/N)

R' = rho L N^2 / A

R' = N^2 R

Ans(D)

{ for 4 and 5 data are missing like in 4th what are radius.

and for 5th, cross section is not visible.}

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