Physics (Test 7)

Tancet Anna University : Civil Engineering

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Q.1
In an electromagnetic wave in free space the rms value of the electric field is 3 V m−1. The peak value of the magnetic field is
A. 1.414 × 10−8 T
B. 1.0 × 10−8  T
C. 2.828 × 10−8 T
D. 2.0 × 10−8 T
Explaination / Solution: Workspace
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Q.2

A thin semi-circular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure. The potential difference developed across the ring when its speed v , is
A. Zero
B. Bvπr2 /2 and P is at higher potential
C. πrBv and R is at higher potential
D. 2rBv and R is at higher potential
Explaination / Solution: Workspace
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Q.3
An inductor 20 mH, a capacitor 50 μF and a resistor 40 Ω are connected in series across a source of emf v = 10 sin 340 t. The power loss in AC circuit is
A. 0.76 W
B. 0.89 W
C. 0.46 W
D. 0.67 W
Explaination / Solution: Workspace
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Q.4
Two identical coils, each with N turns and radius R are placed coaxially at a distance R as shown in the figure. If I is the current passing through the loops in the same direction, then the magnetic field at a point P which is at exactly at R/2 distance between two coils is A. B. C. D. Explaination / Solution: Workspace
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Q.5
A wire of resistance 2 ohms per meter is bent to form a circle of radius 1m. The equivalent resistance between its two diametrically opposite points, A and B as shown in the figure is A. π Ω
B. π/2Ω
C. 2πΩ
D. π/4Ω
Explaination / Solution: Workspace
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Q.6
The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 Ω. The resistance of the wire will be 2 Ω at
A. 1154 K
B. 1100 K
C. 1400 K
D. 1127 K
Explaination / Solution: Workspace
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Q.7
Two identical conducting balls having positive charges q1 and q2 are separated by a center to center distance r. If they are made to touch each other and then separated to the same distance, the force between them will be
A. less than before
B. same as before
C. more than before
D. zero
Explaination / Solution: Workspace
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Q.8
A couple produces,
A. pure rotation
B. pure translation
C. rotation and translation
D. no motion
Explaination / Solution:
No Explaination.

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Q.9
A round object of mass M and radius R rolls down without slipping along an inclined plane. The fractional force,
A. dissipates kinetic energy as heat.
B. decreases the rotational motion.
C. decreases the rotational and transnational motion
D. converts transnational energy into rotational energy
Explaination / Solution:
No Explaination.

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Q.10
If the potential energy of the particle is ­α - β/2 x2, then force experienced by the particle is
A. F=β/2 x2
B. F=βx
C. F=-βx
D. F=-β/2 x2